Auth bypass in Traefik
CVE-2026-114638
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.7 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/traefik/traefik/security/advisories/GHSA-rv2h-qh7j-xrjw (vendor-advisory)
- www.vulncheck.com/advisories/traefik-3.7.0-before-3.7.14-client-ca-mix-up-via-a… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-114638?
- CVE-2026-114638 is a high-severity vulnerability in Traefik, classified under Improper Authentication. CVSS score: 8.7/10. Published 2026-10-22.
- How severe is CVE-2026-114638?
- High severity. CVSS v3 base score is 8.7 out of 10.