CVE-2025-66490 (GCVE-0-2025-66490)
Vulnerability from cvelistv5
Published
2025-12-09 00:35
Modified
2025-12-09 16:03
Severity ?
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CWE
  • CWE-436 - Interpretation Conflict
Summary
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.
References
Impacted products
Vendor Product Version
traefik traefik Version: github.com/traefik/traefik/v3 < 3.6.3
Version: github.com/traefik/traefik/v2 < 2.11.32
Version: github.com/traefik/traefik <= 1.7.34
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