Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-85596

CVE-2026-85596HIGH

Traefik v3.7 Authentication Bypass via TLS Option Conflict

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   P   N   N   H   N   N    8.2   .0043   35.6     —

AFFECTED
  Product  Versions  Fixed
  traefik  3.7.0 –   —

TIMELINE
  Sep 4   Reserved by VulnCheck
  Sep 4   Published (CNA: VulnCheck)
  Sep 16  EXPLOIT PUBLISHED — CVE-2026-85596 (traefik). Public exploit reference added.

CWE-287 · CNA: VulnCheck · CVSS v4.0 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 4, 2026	Reserved	Reserved by VulnCheck
September 4, 2026	Published	Published (CNA: VulnCheck)
September 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-85596 (traefik). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
traefik	traefik	—	3.7.0	—

Weaknesses

CWE-287

References (2)

https://github.com/traefik/traefik/security/advisories/GHSA-j994-9gqj-9hwq [Exploit, Mitigation, Patch, Vendor Advisory]
https://www.vulncheck.com/advisories/traefik-3.7-authentication-bypass-via-tls-option-conflict [Third Party Advisory]

Authoritative record: CVE-2026-85596 at cve.org

Vendors: traefik

Weaknesses: CWE-287

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-85596 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.