What’s Vulnerable › Vulnerabilities

CVE-2025-47952: Traefik allows path traversal using url encoding

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-30 · updated 2026-06-17
• Weakness: CWE-22

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.

Affected products

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

How to fix

Upgrade to a fixed version: Traefik 2.11.25, 3.4.1. Check the vendor advisory for mitigations.

References

• https://github.com/traefik/traefik/commit/08d5dfee0164aa54dd44a467870042e18e8d3f00
• https://github.com/traefik/traefik/releases/tag/v2.11.25
• https://github.com/traefik/traefik/releases/tag/v3.4.1
• https://github.com/traefik/traefik/security/advisories/GHSA-vrch-868g-9jx5

Get alerted when CVE-2025-47952 or the next vulnerability affects your stack