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CVE PROGRAM SOURCE RECORD6.9 Medium

CVE-2026-114656

Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher

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Status
Published
Published
Updated
Assigning organization
VulnCheck

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

traefik traefik

Default version status: unaffected

  • 0 to < 2.11.58affected
  • 2.11.58unaffected
pkg:golang/github.com/traefik/traefik/v2

traefik traefik

Default version status: unaffected

  • 3.0.0 to < 3.7.13affected
  • 3.7.13unaffected
pkg:golang/github.com/traefik/traefik/v3

References