Description
Traefik (pronounced traffic) is an HTTP reverse proxy and load balancer. Prior to versions 2.11.25 and 3.4.1, there is a potential vulnerability in Traefik managing the requests using a PathPrefix, Path or PathRegex matcher. When Traefik is configured to route the requests to a backend using a matcher based on the path, if the URL contains a URL encoded string in its path, it’s possible to target a backend, exposed using another router, by-passing the middlewares chain. This issue has been patched in versions 2.11.25 and 3.4.1.
Metrics
CVSS 3.1 9.1/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| traefik | traefik | < 3.4.1; < 2.11.25 |
References
- https://github.com/traefik/traefik/commit/08d5dfee0164aa54dd44a467870042e18e8d3f00Patch
- https://github.com/traefik/traefik/releases/tag/v2.11.25Release Notes
- https://github.com/traefik/traefik/releases/tag/v3.4.1Release Notes
- https://github.com/traefik/traefik/security/advisories/GHSA-vrch-868g-9jx5Patch, Vendor Advisory
Timeline
- Published
- May 30, 2025
- Last modified
- Jun 17, 2026
- NVD status
- Analyzed