{"id":"GHSA-46wh-3698-f2cx","revision":null,"records":[{"revision":"5f9426bb7ed241f68ffbccd3a5e7851a","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-46wh-3698-f2cx","aliases":["GO-2026-4897"],"title":"Traefik: Deny Rule Bypass via Unauthenticated Malicious gRPC Requests in gRPC-Go Dependency (CVE-2026-33186)","description":"## Summary\n\nThere is a potential vulnerability in Traefik due to its dependency on an affected version of gRPC-Go (CVE-2026-33186).\n\nA remote, unauthenticated attacker can send gRPC requests with a malformed HTTP/2 `:path` pseudo-header omitting the mandatory leading slash (e.g., `Service/Method` instead of `/Service/Method`). While the server routes such requests correctly, path-based authorization interceptors evaluate the raw non-canonical path and fail to match \"deny\" rules, allowing the request to bypass the policy entirely if a fallback \"allow\" rule is present.\n\n## Patches\n\n- https://github.com/traefik/traefik/releases/tag/v2.11.42\n- https://github.com/traefik/traefik/releases/tag/v3.6.12\n- https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.3\n\n## For more information\n\nIf there are any questions or comments about this advisory, please [open an issue](https://github.com/traefik/traefik/issues).\n\n<details>\n<summary>Original Description</summary>\n\n### Summary\nThis CVE hits traefik until Version 3.6.11 and 2.11.41.\ngRPC-Go has an authorization bypass via missing leading slash in :path\n### Details\nAs described in https://github.com/advisories/GHSA-p77j-4mvh-x3m3\n### PoC\nUpdate library version in \nhttps://github.com/traefik/traefik/blob/67c64ed9b25fbb90f1086977a62827133a7aa01b/go.mod#L108\n### Impact\nIs described in https://github.com/advisories/GHSA-p77j-4mvh-x3m3\n\n</details>\n\n\n----------","state":0,"publishedAt":"2026-03-29T15:37:28+00:00","modifiedAt":"2026-09-10T03:50:36.9805778+00:00","affected":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.11.42"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"3.0.0-beta3"},{"kind":"fixed","version":"3.6.12"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"3.7.0-ea.1"},{"kind":"fixed","version":"3.7.0-ea.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/traefik/traefik/security/advisories/GHSA-46wh-3698-f2cx","https://github.com/advisories/GHSA-p77j-4mvh-x3m3","https://github.com/traefik/traefik","https://github.com/traefik/traefik/blob/67c64ed9b25fbb90f1086977a62827133a7aa01b/go.mod#L108","https://github.com/traefik/traefik/releases/tag/v2.11.42","https://github.com/traefik/traefik/releases/tag/v3.6.12","https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.3"],"sourceUrl":"https://github.com/advisories/GHSA-46wh-3698-f2cx","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-46wh-3698-f2cx","identifiers":["GHSA-46wh-3698-f2cx","GO-2026-4897"]},"retained":false,"historicalAffected":[]},{"revision":"a10abb61d95a43aa92f7d7c90abcb798","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4897","aliases":["GHSA-46wh-3698-f2cx"],"title":"Traefik: Deny Rule Bypass via Unauthenticated Malicious gRPC Requests in gRPC-Go Dependency (CVE-2026-33186) in github.com/traefik/traefik","description":"Traefik: Deny Rule Bypass via Unauthenticated Malicious gRPC Requests in gRPC-Go Dependency (CVE-2026-33186) in github.com/traefik/traefik","state":0,"publishedAt":"2026-04-02T18:42:30+00:00","modifiedAt":"2026-04-07T03:44:12.2387442+00:00","affected":[{"ecosystem":"Go","name":"github.com/traefik/traefik","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.11.42"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"3.0.0-beta3"},{"kind":"fixed","version":"3.6.12"},{"kind":"introduced","version":"3.7.0-ea.1"},{"kind":"fixed","version":"3.7.0-ea.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/traefik/traefik/security/advisories/GHSA-46wh-3698-f2cx","https://github.com/advisories/GHSA-p77j-4mvh-x3m3","https://github.com/traefik/traefik/blob/67c64ed9b25fbb90f1086977a62827133a7aa01b/go.mod#L108","https://github.com/traefik/traefik/releases/tag/v2.11.42","https://github.com/traefik/traefik/releases/tag/v3.6.12","https://github.com/traefik/traefik/releases/tag/v3.7.0-ea.3"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4897","license":"OSV · upstream source license applies","key":"osv:GO-2026-4897","identifiers":["GO-2026-4897","GHSA-46wh-3698-f2cx"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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