CVE-2026-88009
Dashboard / Vulnerabilities / CVE-2026-88009
Summary: Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
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.
References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88009.json, https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9, https://github.com/traefik/traefik/pull/13796, https://github.com/traefik/traefik/releases/tag/v2.11.57, https://github.com/traefik/traefik/releases/tag/v3.7.13, https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724, https://nvd.nist.gov/vuln/detail/CVE-2026-88009
Affected packages
Package
Name:
Purl:
