{"id":"CVE-2026-118655","aliases":["DEBIAN-CVE-2026-118655","EUVD-2026-112461","GHSA-xwq5-6cqp-vx96","GO-2026-6885","UBUNTU-CVE-2026-118655"],"status":"published","title":"Echo: Static Middleware Double-Unescape Path Traversal","description":"Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.","severity":{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00303,"percentile":0.23393,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-174"],"published":"2026-10-28T20:03:56Z","modified":"2026-11-05T23:26:17Z","fixes":[{"ecosystem":"Go","package":"github.com/labstack/echo/v5","fixed_in":["5.2.0"],"sources":["ghsa","osv"]},{"ecosystem":"Go","package":"github.com/labstack/echo/v4","fixed_in":["4.15.3"],"sources":["ghsa","osv"]}],"affected":[{"source":"ghsa","ecosystem":"Go","package":"github.com/labstack/echo/v5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.2.0"}]}]},{"source":"ghsa","ecosystem":"Go","package":"github.com/labstack/echo/v4","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.15.3"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"golang-github-labstack-echo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.1-1","4.11.1-2","4.12.0-1","4.2.1-3"]},{"source":"osv","ecosystem":"Debian:13","package":"golang-github-labstack-echo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1"]},{"source":"osv","ecosystem":"Debian:14","package":"golang-github-labstack-echo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1"]},{"source":"osv","ecosystem":"Go","package":"github.com/labstack/echo/v5","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.2.0"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/labstack/echo/v4","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.15.3"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/labstack/echo/v4","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"4.15.3"}]}]},{"source":"osv","ecosystem":"Go","package":"github.com/labstack/echo/v5","ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.2.0"}]}]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"golang-github-labstack-echo.v2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"golang-github-labstack-echo.v3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.5-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"golang-github-labstack-echo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.1-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"golang-github-labstack-echo.v2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"golang-github-labstack-echo.v3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3.10-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"golang-github-labstack-echo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.11.1-2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"golang-github-labstack-echo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"golang-github-labstack-echo","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.12.0-1"]}],"products":[{"vendor":"labstack","product":"echo"},{"vendor":"wikimedia foundation","product":"echo"}],"references":[{"url":"https://github.com/labstack/echo/security/advisories/GHSA-xwq5-6cqp-vx96","tags":["x_refsource_CONFIRM","advisory","web","report"]},{"url":"https://github.com/labstack/echo/issues/2599","tags":["x_refsource_MISC","report","web"]},{"url":"https://github.com/labstack/echo/pull/3006","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/labstack/echo/commit/a9ede66a5a7196411131beb1ee801e75bbaf7ac6","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/labstack/echo/commit/c3fa2a27ff92b2b8db360de614f999ef1da24725","tags":["x_refsource_MISC","fix","web","report"]},{"url":"https://github.com/labstack/echo/releases/tag/v4.15.3","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/labstack/echo/releases/tag/v5.2.0","tags":["x_refsource_MISC","web","report"]},{"url":"https://github.com/advisories/GHSA-xwq5-6cqp-vx96"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/118xxx/CVE-2026-118655.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-118655","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-118655","tags":["advisory"]},{"url":"https://github.com/labstack/echo","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-118655","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-118655","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-118655","title":"Echo: Static Middleware Double-Unescape Path Traversal","description":"Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.","status":"published","published":"2026-10-28T20:03:56.897Z","modified":"2026-10-29T18:29:50.622Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-174"],"updated_at":"2026-11-02T14:20:03.827373Z"}],"euvd":[{"id":"EUVD-2026-112461","description":"Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.","status":"published","published":"2026-10-28T20:03:56Z","modified":"2026-10-29T18:29:50Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T16:59:15.044173Z"}],"ghsa":[{"id":"GHSA-xwq5-6cqp-vx96","title":"Echo has a Static Middleware Double-Unescape Path Traversal","description":"## Summary\n\nCommit a9ede66a (PR #3006, issue #2599) silently fixed a path traversal vulnerability in the Echo web framework's static file middleware.\n\n## Vulnerability\n\nThe static middleware double-unescaped URL paths. Go's net/http already decodes Request.URL.Path, but middleware/static.go unconditionally called url.PathUnescape() again:\n\n```go\n// BEFORE (vulnerable)\npathUnescape := true\n```\n\nThis reassembled path traversal sequences from double-encoded input. An attacker could send GET /%2e%2e%2fsecret.txt or /..%252fsecret.txt and the double-unescape would produce ../secret.txt.\n\n## Fix\n```go\n// AFTER (fixed)\npathUnescape := false\n```\n\nThe commit's test TestStatic_percentEncodedTraversalIsBlocked explicitly verifies traversal vectors are blocked.\n\n## Impact\nArbitrary file read from server filesystem via percent-encoded path traversal.\n\n## References\n- Fix: https://github.com/labstack/echo/commit/a9ede66a\n- Issue: https://github.com/labstack/echo/issues/2599\n- PR: https://github.com/labstack/echo/pull/3006\n\n## Patches\n\nFixed in `github.com/labstack/echo/v5` v5.2.0 and `github.com/labstack/echo/v4` v4.15.3, where the Static middleware stopped unescaping an already decoded path. Maintainer analysis: reading files outside the configured root could not be reproduced; the confirmed impact was that a double-encoded slash (`%252F`) could reach a file under a guarded route when the Static middleware is registered globally. Upgrade to v5.4.0 / v4.16.0 or later, which also includes related fixes for encoded and dot-segment paths.\n\n## Workarounds\n\nKeep files that need protection outside the Static middleware's root directory.","status":"published","published":"2026-10-28T21:04:39Z","modified":"2026-10-28T21:04:40Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-174"],"updated_at":"2026-11-02T14:41:39.926569Z"}],"nvd":[{"id":"CVE-2026-118655","description":"Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.","status":"published","published":"2026-10-28T20:17:22.723Z","modified":"2026-10-29T19:17:18.69Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-174"],"updated_at":"2026-11-02T14:13:04.6346Z"}],"osv":[{"id":"CVE-2026-118655","title":"Echo: Static Middleware Double-Unescape Path Traversal","description":"Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.","status":"published","published":"2026-10-28T20:03:56.897Z","modified":"2026-11-05T23:26:17.528492081Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-174"],"updated_at":"2026-11-06T00:02:13.631839Z"},{"id":"DEBIAN-CVE-2026-118655","description":"Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.","status":"published","published":"2026-10-28T20:17:22.723Z","modified":"2026-10-30T09:49:19.084110595Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:51.374409Z"},{"id":"GHSA-xwq5-6cqp-vx96","title":"Echo has a Static Middleware Double-Unescape Path Traversal","description":"## Summary\n\nCommit a9ede66a (PR #3006, issue #2599) silently fixed a path traversal vulnerability in the Echo web framework's static file middleware.\n\n## Vulnerability\n\nThe static middleware double-unescaped URL paths. Go's net/http already decodes Request.URL.Path, but middleware/static.go unconditionally called url.PathUnescape() again:\n\n```go\n// BEFORE (vulnerable)\npathUnescape := true\n```\n\nThis reassembled path traversal sequences from double-encoded input. An attacker could send GET /%2e%2e%2fsecret.txt or /..%252fsecret.txt and the double-unescape would produce ../secret.txt.\n\n## Fix\n```go\n// AFTER (fixed)\npathUnescape := false\n```\n\nThe commit's test TestStatic_percentEncodedTraversalIsBlocked explicitly verifies traversal vectors are blocked.\n\n## Impact\nArbitrary file read from server filesystem via percent-encoded path traversal.\n\n## References\n- Fix: https://github.com/labstack/echo/commit/a9ede66a\n- Issue: https://github.com/labstack/echo/issues/2599\n- PR: https://github.com/labstack/echo/pull/3006\n\n## Patches\n\nFixed in `github.com/labstack/echo/v5` v5.2.0 and `github.com/labstack/echo/v4` v4.15.3, where the Static middleware stopped unescaping an already decoded path. Maintainer analysis: reading files outside the configured root could not be reproduced; the confirmed impact was that a double-encoded slash (`%252F`) could reach a file under a guarded route when the Static middleware is registered globally. Upgrade to v5.4.0 / v4.16.0 or later, which also includes related fixes for encoded and dot-segment paths.\n\n## Workarounds\n\nKeep files that need protection outside the Static middleware's root directory.","status":"published","published":"2026-10-28T21:04:39Z","modified":"2026-11-05T23:26:17.528492081Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-174"],"updated_at":"2026-11-06T00:02:13.631839Z"},{"id":"UBUNTU-CVE-2026-118655","description":"Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.","status":"published","published":"2026-10-28T20:17:00Z","modified":"2026-11-05T04:42:51Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-05T13:33:25.727744Z"},{"id":"GO-2026-6885","title":"Echo has a Static Middleware Double-Unescape Path Traversal in github.com/labstack/echo","description":"Echo has a Static Middleware Double-Unescape Path Traversal in github.com/labstack/echo","status":"published","published":"2026-11-05T22:54:32Z","modified":"2026-11-05T23:15:16.470003337Z","updated_at":"2026-11-06T00:02:13.631839Z"}]}}