CVE-2025-32431: Traefik has a possible vulnerability with the path matchers

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-04-21 · updated 2026-06-17
Weakness: CWE-22

Description

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: before 2.11.24; from 3.0.0 before 3.3.6; 3.4.0, 3.4.0-rc1 — fixed in 2.11.24, 3.3.6

How to fix

Upgrade to a fixed version: Traefik 2.11.24, 3.3.6. Check the vendor advisory for mitigations.

References

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