---
id: CVE-2026-85596
title: >-
  Traefik versions >= v3.7.0 and <= v3.7.10 contain an authentication bypass in
  the Kubernetes Ingress NGINX provider
summary: >-
  Traefik versions >= v3.7.0 and <= v3.7.10 contain an authentication bypass in
  the Kubernetes Ingress NGINX provider. The TLS option generated for an Ingress
  carrying the nginx.ingress.kubernetes.io/auth-tls-secret annotation was named
  af…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-287
  - CWE-305
vendor: traefik
product: traefik
affected:
  - 'traefik >= 3.7.0, < 3.7.11'
patched:
  - traefik 3.7.11
published: '2026-09-04'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T20:42:34.950'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85596'
references:
  - url: 'https://github.com/traefik/traefik/security/advisories/GHSA-j994-9gqj-9hwq'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/traefik-3.7-authentication-bypass-via-tls-option-conflict
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85596.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-85596'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2529028'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-85596'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85596'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
  - score-dispute
epss: 0.00241
epssPercentile: 0.15515
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-10T14:19:24.535836Z'
scores:
  nvd: 9.8
  cna: 8.2
  vendor: 7.5
ingestedAt: '2026-09-06T01:47:57.583Z'
---

## Overview

Traefik versions >= v3.7.0 and <= v3.7.10 contain an authentication bypass in the Kubernetes Ingress NGINX provider. The TLS option generated for an Ingress carrying the nginx.ingress.kubernetes.io/auth-tls-secret annotation was named after the Ingress namespace and name. As a result, two Ingress objects sharing the same host, the same client CA secret, and the same client-authentication mode produced two distinct TLS option names for that host. Traefik treats this as a TLS options conflict and falls back to the entry point's default TLS configuration, which does not request a client certificate, so a route configured with nginx.ingress.kubernetes.io/auth-tls-verify-client: "on" becomes reachable without a client certificate. Only the v3.7 line is affected; the issue is fixed in v3.7.11.

## Affected

- `traefik >= 3.7.0, < 3.7.11`

## Remediation

Upgrade past the affected range:

- `traefik 3.7.11`

## Vendor advisories

- **Red Hat VEX** · Important · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85596.json)