CVE-2025-66490

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.

• CWE-436

• https://github.com/traefik/traefik/releases/tag/v2.11.32Release Notes
• https://github.com/traefik/traefik/releases/tag/v3.6.4Release Notes
• https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2cExploit, Vendor Advisory
• https://github.com/traefik/traefik/security/advisories/GHSA-gm3x-23wp-hc2cExploit, Vendor Advisory

Published

Dec 9, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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