GHSA-rhg6-2vjh-j5qc

Duplicate Advisory: Traefik: Authentication Bypass via Path Traversal in ReplacePathRegex Middleware

Published

2026-07-22

Modified

2026-08-06

Sources

github-advisory

Summary

## Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-cxjq-mrr5-89rv. This link is maintained to preserve external references. ## Original Description Traefik versions = v3.6.0 = v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex "^/api(.*)", replacement "/$1"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form. An unauthenticated remote attacker can send a crafted request (e.g. GET /api../admin) that produces an un-normalized path such as /../admin, which a backend that normalizes paths resolves to a protected route, bypassing authentication middleware. Fixed in v2.11.52, v3.6.23, and v3.7.7.

Affected packages

Remediation: No patched version is listed by GitHub.

References

• https://github.com/advisories/GHSA-rhg6-2vjh-j5qc