CVE-2025-32431: 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. In versions prior to 2.11.24, 3.3.6, and 3.4.0-rc2. 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 /../ 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 2.11.24, 3.3.6, and 3.4.0-rc2. A workaround involves adding a `PathRegexp` rule to the matcher to prevent matching a route with a `/../` in the path.

Affected products

• Traefik Traefik: before 2.11.24 (fixed in 2.11.24); from 3.0.0, before 3.3.6 (fixed in 3.3.6); version 3.4.0 only

Published 2025-04-21. Last modified 2026-06-17.