What’s Vulnerable › Vulnerabilities

CVE-2026-114638: Traefik v3.7.0 before v3.7.14 Client CA Mix-up via auth-tls-secret Name Collision

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-22 · updated 2026-10-27
• Weakness: CWE-287

Description

Traefik v3.7.0 before v3.7.14 contains an improper authentication vulnerability in the Kubernetes Ingress NGINX provider that merges client CAs when auth-tls-secret names collide after dot-to-dash normalization. Attackers holding certificates from another host's CA can access a host requiring its own client CA, while that host's legitimate clients are refused.

Affected products

• Traefik: from 3.7.0 before 3.7.14 — fixed in 3.7.14
• Traefik: from 3.7.0 before 3.7.14 — fixed in 3.7.14

How to fix

Upgrade to a fixed version: Traefik 3.7.14; Traefik 3.7.14. Check the vendor advisory for mitigations.

References

• https://github.com/traefik/traefik/security/advisories/GHSA-rv2h-qh7j-xrjw
• https://www.vulncheck.com/advisories/traefik-3.7.0-before-3.7.14-client-ca-mix-up-via-auth-tls-secret-name-collision

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