MEDIUM 6.9 NVD
CVE-2026-114656
Traefik before 2.11.58 and 3.7.13 contains an authentication bypass vulnerability that allows unauthenticated clients to skip client-certificate checks because
Traefik before 2.11.58 and 3.7.13 contains an authentication bypass vulnerability that allows unauthenticated clients to skip client-certificate checks because negated Host matchers are counted as served domains. Attackers can reach backends protected by RequireAndVerifyClientCert when a router rule with !Host() creates a TLS options conflict that falls back to the default options.
References
- https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww
- https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-neg
This medium severity vulnerability with a CVSS score of 6.9 was published on 2026-10-22 via NVD.
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