Vulnerability Description
Traefik from v3.7.0 before v3.7.14 contains an authentication bypass vulnerability in its Kubernetes Ingress-NGINX provider that forwards client-supplied Ssl-Client-* headers on the plaintext HTTP router. When ssl-redirect is disabled alongside auth-tls-pass-certificate-to-upstream, unauthenticated attackers can send Ssl-Client-Verify: SUCCESS with a chosen certificate subject and issuer to impersonate mTLS identities.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | >= 3.7.0, < 3.7.14 |
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/security/advisories/GHSA-mwrr-6hp4-pxr6Vendor Advisory
- https://www.vulncheck.com/advisories/traefik-3.7.0-before-3.7.14-mtls-header-spoThird Party Advisory
FAQ
What is CVE-2026-114640?
CVE-2026-114640 is a vulnerability with a CVSS score of 8.7 (HIGH). Traefik from v3.7.0 before v3.7.14 contains an authentication bypass vulnerability in its Kubernetes Ingress-NGINX provider that forwards client-supplied Ssl-Client-* headers on the plaintext HTTP rou...
How severe is CVE-2026-114640?
CVE-2026-114640 has been rated HIGH with a CVSS base score of 8.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-114640?
Check the references section above for vendor advisories and patch information. Affected products include: Traefik Traefik.