🛡️ CVE-2025-66490
🟡 CVSS 6.5 — Medium ✅ No Known Exploit CWE-436 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Traefik is an HTTP reverse proxy and load balancer. For versions prior to 2.11.32 and 2.11.31 through 3.6.2, requests using PathPrefix, Path or PathRegex matchers can bypass path normalization. When Traefik uses path-based routing, requests containing URL-encoded restricted characters (/, \, Null, ;, ?, #) can bypass the middleware chain and reach unintended backends. For example, a request to http://mydomain.example.com/admin%2F could reach service-a without triggering my-security-middleware, bypassing security controls for the /admin/ path. This issue is fixed in versions 2.11.32 and 3.6.3.

Details

Severity Medium
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE CWE-436
Public Exploit ✅ No
Source NVD
Published 2025-12-08
Updated 2026-06-15
Modified 2026-04-16
Fix URL N/A

Affected Packages

Software From version Fixed in
github.com/traefik/traefik — —
github.com/traefik/traefik/v2 — —
github.com/traefik/traefik/v3 — —
traefik 3.0.0 3.6.3

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