high8.2
CVE-2026-88009
Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/traefik/traefik/v3 | >= 3.0.0, < 3.7.13 | 3.7.13 |
| go | github.com/traefik/traefik/v2 | < 2.11.57 | 2.11.57 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Traefik | Traefik | before 2.11.57 from 3.0.0 before 3.7.13 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-f52w-8j3h-j724
- https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724
- https://nvd.nist.gov/vuln/detail/CVE-2026-88009
- https://github.com/traefik/traefik/pull/13796
- https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9
- https://github.com/traefik/traefik/releases/tag/v2.11.57
- https://github.com/traefik/traefik/releases/tag/v3.7.13