---
id: CVE-2026-114656
title: Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
summary: >-
  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 back…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N'
cvssSource: cna
cwe:
  - CWE-436
vendor: traefik
product: traefik
affected:
  - traefik < 2.11.58
  - traefik >= 3.0.0 < 3.7.13
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T01:43:42.056Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114656'
references:
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww'
    label: GitHub Security Advisory (GHSA-2272-4vv8-65ww)
  - url: >-
      https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher
    label: >-
      VulnCheck Advisory: Traefik before 2.11.58 and 3.7.13 mTLS Bypass via
      Negated Host Matcher
tags:
  - cve.org
ingestedAt: '2026-10-22T02:23:25.184Z'
---

## Overview

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

- `traefik < 2.11.58`
- `traefik >= 3.0.0 < 3.7.13`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.