---
id: "CVE-2026-119572"
kind: "vulnerability"
aliases: ["CVE-2026-119572"]
title: "Traefik: mTLS client certificate check silently skipped on shared Ingress hosts"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["ingress", "kubernetes", "mtls", "runtime", "traefik"]
not_affected_if: ["default-config", "no-auth-tls-secret", "single-ingress-per-host"]
published_at: "2026-10-30T14:16:46+00:00"
first_seen_at: "2026-10-30T14:30:54+00:00"
updated_at: "2026-10-30T14:32:32+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-119572", "first_seen_at": "2026-10-30T14:30:54+00:00"}]
---

# Traefik: mTLS client certificate check silently skipped on shared Ingress hosts

Traefik's Kubernetes Ingress NGINX provider can drop the auth-tls-secret mTLS requirement when another Ingress on the same host and path has no matching auth-tls settings. An unauthenticated attacker can then reach backends that were meant to require client certificates.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `traefik version` or check the image tag to see whether it is between `3.7.0-ea.1` and `3.7.15`.
- Search Ingress objects for the `auth-tls-secret` annotation and look for other Ingresses on the same host and path without matching auth-tls settings.

## Fix

- Move Traefik to `3.7.15` or later.

## Timeline

- 2026-10-30T14:30:54+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-119572

## From the sources

Traefik from 3.7.0-ea.1 before 3.7.15 contains an authentication bypass vulnerability in the Kubernetes Ingress NGINX provider that silently disables mTLS configured via the auth-tls-secret annotation. When another Ingress declares a path on the same host without matching auth-tls settings, Traefik falls back to default TLS options, letting unauthenticated attackers reach backends requiring client certificates.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_