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.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-88009)

ID	Name	Product	Family	Type	Severity
464195	Echo: github.com/traefik/traefik/v3: security update to 2.11.57	Tenable Cloud Security	Echo Local Security Checks	Local	high
464195	Echo: github.com/traefik/traefik/v3: security update to 2.11.57	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
447923	SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-f52w-8j3h-j724)	Tenable Cloud Security	SCA Checks	Local	high
447923	SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-f52w-8j3h-j724)	Tenable Self-Hosted Container Security	SCA Checks	Local	high

Detections

Analytics

CVE-2026-88009

high

Tenable Plugins

high

high

high

high