Vulnerability Description
Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 stores its NTLM/Kerberos backend round tripper in a client-connection slot not keyed by ServersTransport, so one service's TLS client configuration is reused for another service's backend. An unauthenticated client can arm the slot via a backend issuing an NTLM or Negotiate challenge, then reach another service on the same keep-alive connection, bypassing its root CAs, server name, and certificate verification.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Traefik | Traefik | >= 2.11.0, < 2.11.58 |
Related Weaknesses (CWE)
References
- https://github.com/traefik/traefik/security/advisories/GHSA-cw35-4q88-3rmpVendor Advisory
- https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-tls-confiThird Party Advisory
FAQ
What is CVE-2026-114642?
CVE-2026-114642 is a vulnerability with a CVSS score of 8.7 (HIGH). Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 stores its NTLM/Kerberos backend round tripper in a client-connection slot not keyed by ServersTransport, so one service's TLS client configuratio...
How severe is CVE-2026-114642?
CVE-2026-114642 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-2026-114642?
Check the references section above for vendor advisories and patch information. Affected products include: Traefik Traefik.