CVE-2025-47952: Traefik

Critical severity, CVSS 9.1. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

• Traefik Traefik: before 2.11.25 (fixed in 2.11.25); from 3.0.0, before 3.4.1 (fixed in 3.4.1)

Published 2025-05-30. Last modified 2026-06-17.