---
id: CVE-2026-114640
title: >-
  Traefik v3.7.0 before v3.7.14 mTLS Header Spoofing via Ingress-NGINX HTTP
  Router
summary: >-
  Traefik from v3.7.0 before v3.7.14 contains an authentication bypass
  vulnerability in its Kubernetes Ingress-NGINX provider that forwards
  client-supplied Ssl-Client-* headers on the plaintext HTTP router. When
  ssl-redirect is disabled al…
severity: high
cvss: 8.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N'
cvssSource: cna
cwe:
  - CWE-290
vendor: traefik
product: traefik
affected:
  - traefik >= 3.7.0 < 3.7.14
published: '2026-10-22'
updated: '2026-10-22'
sourceUpdated: '2026-10-22T01:43:39.899Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-114640'
references:
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-mwrr-6hp4-pxr6'
    label: GitHub Security Advisory (GHSA-mwrr-6hp4-pxr6)
  - url: >-
      https://www.vulncheck.com/advisories/traefik-3.7.0-before-3.7.14-mtls-header-spoofing-via-ingress-nginx-http-router
    label: >-
      VulnCheck Advisory: Traefik v3.7.0 before v3.7.14 mTLS Header Spoofing via
      Ingress-NGINX HTTP Router
tags:
  - cve.org
ingestedAt: '2026-10-22T02:23:25.185Z'
---

## Overview

Traefik from v3.7.0 before v3.7.14 contains an authentication bypass vulnerability in its Kubernetes Ingress-NGINX provider that forwards client-supplied Ssl-Client-* headers on the plaintext HTTP router. When ssl-redirect is disabled alongside auth-tls-pass-certificate-to-upstream, unauthenticated attackers can send Ssl-Client-Verify: SUCCESS with a chosen certificate subject and issuer to impersonate mTLS identities.

## Affected

- `traefik >= 3.7.0 < 3.7.14`

## Remediation

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