CVE-2026-88009
Description
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.
How to fix
- traefik traefik2.11.57, 3.7.13 or later
- github.com/traefik/traefik/v33.7.13 or later
- github.com/traefik/traefik/v22.11.57 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| traefik traefik | v < 2.11.57, 3.0.0 ≤ v < 3.7.13 | 2.11.57, 3.7.13 |
| github.com/traefik/traefik/v3Go | 3.0.0 ≤ v < 3.7.13 | 3.7.13 |
| github.com/traefik/traefik/v2Go | v < 2.11.57 | 2.11.57 |
| github.com/traefik/traefikGo | No range specified | — |
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