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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.

Traefik (pronounced traffic) is an HTTP reverse proxy and load balance ...

Traefik allows path traversal using url encoding

ALT-PU-2025-7693: package `traefik` update to version 3.4.1-alt1

ALT-PU-2025-12511: package `traefik` update to version 3.5.0-alt1