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CVE-2026-85596

9.8, critical

traefik Improper Authentication Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
9.8, critical critical CVSS v3.1
EPSS, next 30 days
0.4% higher than 36.3% of scored CVEs
Exploitation
Exploit code published
Published
4 Sept 2026a month ago

Description

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.

Details

Vendor
Traefik
Product
traefik
Weakness
CWE-287 (opens in a new tab)
Status
Analyzed
Updated
8 Oct 2026
Assigner
disclosure@vulncheck.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References 2

Exploit code 1

Advisories 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Traefik CVEs

Every Traefik CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-88007 traefik Improper Authentication Vulnerability EPSS 0.6% 9.1, critical
  • CVE-2026-88008 traefik HTTP Request Smuggling Vulnerability EPSS 0.5% 9.1, critical
  • CVE-2026-88879 Traefik is an HTTP reverse proxy and load balancer EPSS 0.3% 8.2, high
  • CVE-2026-88004 Traefik is an open source HTTP reverse proxy and load balancer EPSS 0.5% 7.4, high
  • CVE-2026-88009 traefik HTTP Request Smuggling Vulnerability EPSS 0.4% 8.2, high
  • CVE-2026-88011 Traefik is an open source HTTP reverse proxy and load balancer EPSS 0.4% 8.1, high
  • CVE-2026-85594 traefik Authorization Bypass Through User-Controlled Key Vulnerability EPSS 0.5% 9.8, critical
  • CVE-2026-85595 traefik Improper Authentication Vulnerability EPSS 0.7% 9.8, critical

Beyond this page

Is CVE-2026-85596 in your network?

This page tells you how dangerous CVE-2026-85596 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

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Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.