CVE-2026-88009
highTraefik is an open source HTTP reverse proxy and load balancer.
Vendor / product: Traefik — traefik
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N Affected products
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
References
- https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9 security-advisories@github.com
- https://github.com/traefik/traefik/pull/13796 security-advisories@github.com
- https://github.com/traefik/traefik/releases/tag/v2.11.57 security-advisories@github.com
- https://github.com/traefik/traefik/releases/tag/v3.7.13 security-advisories@github.com
- https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724 security-advisories@github.com