CVE-2026-71326
Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
Traefik is an open source HTTP reverse proxy and load balancer. From 3.6.11 until 3.6.25 and 3.7.10, Traefik's BasicAuth middleware in pkg/middlewares/auth/basic_auth.go deduplicates concurrent password checks with a singleflight key built from the delimiter-free concatenation of password and secret, allowing an attacker who has a valid credential and the stored hash to authenticate as an unconfigured username when headerField trusts the forwarded identity. This issue is fixed in 3.6.25 and 3.7.10.
| CWE | CWE-287 |
| Vendor | traefik |
| Product | traefik |
| Published | Aug 6, 2026 |
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Affected Versions
traefik / traefik
>= 3.6.11, < 3.6.25 >= 3.7.0, < 3.7.10
References
github.com: https://github.com/traefik/traefik/security/advisories/GHSA-6765-c87h-8mrf github.com: https://github.com/traefik/traefik/pull/13572 github.com: https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350 github.com: https://github.com/traefik/traefik/releases/tag/v3.6.25 github.com: https://github.com/traefik/traefik/releases/tag/v3.7.10