{"id":"CVE-2026-76242","aliases":["EUVD-2026-62406","GHSA-9vp8-3hmv-8fgh","GHSA-rgmr-4wwg-2c6j"],"status":"published","title":"stigmem Federation Peer Registration Authentication Bypass","description":"stigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a separate administrator out-of-band fingerprint approval step. On nodes that accept federation peer registration over a network where initial registration can be intercepted or misdirected, an attacker can register a malicious peer and gain access to or tamper with federation traffic. Fixed in 0.9.0a2, which introduces a pending approval flow requiring administrator fingerprint verification before peer tokens are accepted.","severity":{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00346,"percentile":0.28391,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-295","CWE-345"],"published":"2026-05-29T22:18:19Z","modified":"2026-10-28T02:31:02Z","fixes":[{"ecosystem":"PyPI","package":"stigmem-node","fixed_in":["0.9.0a2"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"PyPI","package":"stigmem-node","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.0a2"}]}]},{"source":"osv","ecosystem":"PyPI","package":"stigmem-node","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.0a2"}]}],"versions":["0.9.0a1"]}],"products":[{"vendor":"eidetic-labs","product":"stigmem"}],"references":[{"url":"https://github.com/eidetic-labs/stigmem/security/advisories/GHSA-9vp8-3hmv-8fgh","tags":["vendor-advisory","advisory","web"]},{"url":"https://www.vulncheck.com/advisories/stigmem-federation-peer-registration-authentication-bypass","tags":["third-party-advisory","advisory"]},{"url":"https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35","tags":["web"]},{"url":"https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/SECURITY.md","tags":["web"]},{"url":"https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2","tags":["web"]},{"url":"https://github.com/advisories/GHSA-9vp8-3hmv-8fgh"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-76242","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-rgmr-4wwg-2c6j"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76242.json","tags":["advisory"]},{"url":"https://github.com/eidetic-labs/stigmem","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-76242","title":"stigmem Federation Peer Registration Authentication Bypass","description":"stigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a separate administrator out-of-band fingerprint approval step. On nodes that accept federation peer registration over a network where initial registration can be intercepted or misdirected, an attacker can register a malicious peer and gain access to or tamper with federation traffic. Fixed in 0.9.0a2, which introduces a pending approval flow requiring administrator fingerprint verification before peer tokens are accepted.","status":"published","published":"2026-08-19T14:02:19.435Z","modified":"2026-08-20T15:38:01.701Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T13:46:21.568011Z"}],"euvd":[{"id":"EUVD-2026-62406","description":"stigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a separate administrator out-of-band fingerprint approval step. On nodes that accept federation peer registration over a network where initial registration can be intercepted or misdirected, an attacker can register a malicious peer and gain access to or tamper with federation traffic. Fixed in 0.9.0a2, which introduces a pending approval flow requiring administrator fingerprint verification before peer tokens are accepted.","status":"published","published":"2026-08-19T14:02:19Z","modified":"2026-08-20T15:38:01Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-02T18:01:39.722145Z"}],"ghsa":[{"id":"GHSA-9vp8-3hmv-8fgh","title":"stigmem-node's federation peer registration lacked explicit out-of-band approval","description":"### Impact\nFederation peer registration accepted peer key material during registration without a separate administrator approval step based on an out-of-band fingerprint check. Impacted deployments are nodes that accept federation peer registration across a network where initial registration could be intercepted or misdirected.\n\n### Patches\nPatched in 0.9.0a2. Peer registration now uses a pending approval flow, and peer tokens are not accepted until an administrator approves the peer using the expected fingerprint.\n\n### Workarounds\nBefore upgrading, restrict peer registration endpoints to trusted administrative networks and verify peer public-key fingerprints out of band before allowing federation traffic.\n\n### Upgrade\nUpgrade to the patched release:\n\n```bash\npip install --upgrade --pre stigmem-node\n```\n\nIf developers install through the Stigmem meta-package instead, they should use the matching extra for deployments, for example:\n\n```bash\npip install --upgrade --pre 'stigmem[node]'\n```\n\n### Resources\n- Release: https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2\n- Changelog: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35\n- Security policy and posture: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/SECURITY.md","status":"published","published":"2026-05-29T22:18:19Z","modified":"2026-05-29T22:18:21Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-295","CWE-345"],"updated_at":"2026-11-02T14:40:15.638885Z"},{"id":"GHSA-rgmr-4wwg-2c6j","title":"stigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a...","description":"stigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a separate administrator out-of-band fingerprint approval step. On nodes that accept federation peer registration over a network where initial registration can be intercepted or misdirected, an attacker can register a malicious peer and gain access to or tamper with federation traffic. Fixed in 0.9.0a2, which introduces a pending approval flow requiring administrator fingerprint verification before peer tokens are accepted.","status":"published","published":"2026-08-19T15:32:36Z","modified":"2026-08-19T15:32:46Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/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":"critical"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T15:10:39.892418Z"}],"nvd":[{"id":"CVE-2026-76242","description":"stigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a separate administrator out-of-band fingerprint approval step. On nodes that accept federation peer registration over a network where initial registration can be intercepted or misdirected, an attacker can register a malicious peer and gain access to or tamper with federation traffic. Fixed in 0.9.0a2, which introduces a pending approval flow requiring administrator fingerprint verification before peer tokens are accepted.","status":"published","published":"2026-08-19T14:17:56.567Z","modified":"2026-09-11T18:28:15.52Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/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":"critical","assessor":"secondary"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:12:39.962615Z"}],"osv":[{"id":"CVE-2026-76242","title":"stigmem Federation Peer Registration Authentication Bypass","description":"stigmem-node 0.9.0a1 accepts federation peer key material during peer registration without a separate administrator out-of-band fingerprint approval step. On nodes that accept federation peer registration over a network where initial registration can be intercepted or misdirected, an attacker can register a malicious peer and gain access to or tamper with federation traffic. Fixed in 0.9.0a2, which introduces a pending approval flow requiring administrator fingerprint verification before peer tokens are accepted.","status":"published","published":"2026-08-19T14:02:19.435Z","modified":"2026-10-28T02:31:02.107872735Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T15:45:17.102988Z"},{"id":"GHSA-9vp8-3hmv-8fgh","title":"stigmem-node's federation peer registration lacked explicit out-of-band approval","description":"### Impact\nFederation peer registration accepted peer key material during registration without a separate administrator approval step based on an out-of-band fingerprint check. Impacted deployments are nodes that accept federation peer registration across a network where initial registration could be intercepted or misdirected.\n\n### Patches\nPatched in 0.9.0a2. Peer registration now uses a pending approval flow, and peer tokens are not accepted until an administrator approves the peer using the expected fingerprint.\n\n### Workarounds\nBefore upgrading, restrict peer registration endpoints to trusted administrative networks and verify peer public-key fingerprints out of band before allowing federation traffic.\n\n### Upgrade\nUpgrade to the patched release:\n\n```bash\npip install --upgrade --pre stigmem-node\n```\n\nIf developers install through the Stigmem meta-package instead, they should use the matching extra for deployments, for example:\n\n```bash\npip install --upgrade --pre 'stigmem[node]'\n```\n\n### Resources\n- Release: https://github.com/eidetic-labs/stigmem/releases/tag/v0.9.0a2\n- Changelog: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/CHANGELOG.md#L14-L35\n- Security policy and posture: https://github.com/eidetic-labs/stigmem/blob/v0.9.0a2/SECURITY.md","status":"published","published":"2026-05-29T22:18:19Z","modified":"2026-08-20T04:04:15.60102675Z","cvss":[{"version":"4.0","score":9.1,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-295","CWE-345"],"updated_at":"2026-11-02T15:46:44.225359Z"}]}}