What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% 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 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.

Affected products

• Traefik: from 2.11.0 before 2.11.58; from 3.0.0 before 3.7.14 — fixed in 2.11.58, 3.7.14
• Traefik: from 2.11.0 before 2.11.58; from 3.0.0 before 3.7.14 — fixed in 2.11.58, 3.7.14

How to fix

Upgrade to a fixed version: Traefik 2.11.58, 3.7.14; Traefik 2.11.58, 3.7.14. Check the vendor advisory for mitigations.

References

• https://github.com/traefik/traefik/security/advisories/GHSA-qm9f-w54v-q2qh
• https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-authentication-bypass-via-negotiate-connection-pool

Get alerted when CVE-2026-114639 or the next vulnerability affects your stack