CVE-2026-114639 Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool

What is CVE-2026-114639?

CVE-2026-114639 is a high-severity vulnerability in Traefik Traefik, published on 22 Oct 2026.

Official description

Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 contains an authentication bypass because a first request preauthenticated with an Authorization: Negotiate token authenticates a socket in the globally shared backend connection pool, which is never isolated. Unauthenticated attackers on separate frontend connections can be assigned that NTLM/Kerberos-bound socket and perform reads or writes with the victim's identity.

Weakness: CWE-287

Which versions are affected by CVE-2026-114639?

It affects 1 product.

Products include Traefik Traefik.

How do I fix CVE-2026-114639?

Upgrade to a fixed version.

Is CVE-2026-114639 being exploited?

There is no known exploitation of CVE-2026-114639 in the wild and no public exploit code.

Other vulnerabilities in Traefik Traefik

• CVE-2024-45410 HTTP client can remove the X-Forwarded headers in Traefik Critical 9.8
• CVE-2026-88877 Traefik v3.7.0 Authentication Bypass via from-to-www-redirect Critical 9.3
• CVE-2026-85595 Traefik before v2.11.55 and v3.0.0 through v3.7.10 Authentication Bypass via digestAuth Critical 9.3
• CVE-2026-88007 Traefik HTTP/3 Backend NTLM Connection Reuse Critical 9.1
• CVE-2026-88009 Traefik: Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging High 8.8

All Traefik Traefik vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-qm9f-w54v-q2qh, GHSA-wx2g-x89x-v9j3.