CVE-2026-114656

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Traefik

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-436CWE-436

How to fix

Update

traefik traefik2.11.58, 3.7.13 or later

Vendor advisories

github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww

Affected products

Product	Affected versions	Fixed in
traefik traefik	v < 2.11.58, 3.0.0 ≤ v < 3.7.13	2.11.58, 3.7.13

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