Vulnerability Details CVE-2026-85596
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 13.2%
CVSS Severity
CVSS v3 Score 9.8
References
Products affected by CVE-2026-85596
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cpe:2.3:a:traefik:traefik:3.7.0
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cpe:2.3:a:traefik:traefik:3.7.1
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cpe:2.3:a:traefik:traefik:3.7.10
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cpe:2.3:a:traefik:traefik:3.7.2
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cpe:2.3:a:traefik:traefik:3.7.3
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cpe:2.3:a:traefik:traefik:3.7.4
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cpe:2.3:a:traefik:traefik:3.7.5
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cpe:2.3:a:traefik:traefik:3.7.6
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cpe:2.3:a:traefik:traefik:3.7.7
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cpe:2.3:a:traefik:traefik:3.7.8
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cpe:2.3:a:traefik:traefik:3.7.9