CVE-2026-71326
CVE-2026-71326 · Traefik: BasicAuth singleflight key collision allows authenticated identity spoofing
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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.
CVSS 2.1 · Niedrig · EPSS 0,3%
- Veröffentlicht
- Aktualisiert
Technologie-Stack: web
Betroffene Produkte und Versionen
traefik
- Softwareversionen
- >= 3.6.11, < 3.6.25: Betroffen
- >= 3.7.0, < 3.7.10: Betroffen
Keine Korrektur veröffentlicht
Originalquellen
- https://github.com/traefik/traefik/security/advisories/GHSA-6765-c87h-8mrf
- https://github.com/traefik/traefik/pull/13572
- https://github.com/traefik/traefik/commit/b5ace8eb5d6779980567f5e75efd2d9e08b7e350
- https://github.com/traefik/traefik/releases/tag/v3.6.25
- https://github.com/traefik/traefik/releases/tag/v3.7.10
- https://nvd.nist.gov/vuln/detail/CVE-2026-71326