{"id":"CVE-2026-88009","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-88009","summary":"Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving…","details":"Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.","published":"2026-09-10T16:18:07.780","modified":"2026-09-10T16:18:07.780","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":{"url":"https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9","label":"traefik/traefik@58d1e9c"},"references":[{"type":"WEB","url":"https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9"},{"type":"WEB","url":"https://github.com/traefik/traefik/pull/13796"},{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v2.11.57"},{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v3.7.13"},{"type":"WEB","url":"https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-10T16:18:07.780"}}