CVE-2025-47952 Traefik allows path traversal using url encoding
Attackers can bypass middleware chains and target unintended backends via URL-encoded path traversal in Traefik reverse proxy configurations.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-47952?
CVE-2025-47952 is a low-severity path traversal vulnerability in Traefik Traefik, published on 30 May 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-22
Which versions are affected by CVE-2025-47952?
9 open source packages ship an affected version, including github.com/traefik/traefik, github.com/traefik/traefik/v2 and github.com/traefik/traefik/v3. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/traefik/traefik Go | All versions | None |
github.com/traefik/traefik Go | All versions to 1.7.34 | None |
github.com/traefik/traefik Go | All versions to 1.7.34 | None |
github.com/traefik/traefik/v2 Go | All versions | 2.11.25 |
github.com/traefik/traefik/v2 Go | All versions | 2.11.25 |
github.com/traefik/traefik/v2 Go | All versions | 2.11.25 |
3 more packages
github.com/traefik/traefik/v3 Go | All versions | 3.4.1 |
github.com/traefik/traefik/v3 Go | All versions | 3.4.1 |
github.com/traefik/traefik/v3 Go | All versions | 3.4.1 |
Products include Traefik Traefik.
How do I fix CVE-2025-47952?
Upgrade to a fixed version.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2025-47952 being exploited?
There is no known exploitation of CVE-2025-47952 in the wild and no public exploit code.
Other vulnerabilities in Traefik Traefik
- CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik
- CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect
- CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth
- CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse
- CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging
Sources
Also known as CLEANSTART-2026-VZ72976, ECHO-a96b-9523-5c06, GHSA-vrch-868g-9jx5, GO-2025-3719, MINI-2mgj-m65x-255f, MINI-c9pj-6qv4-ff2c.