What’s Vulnerable › Vulnerabilities

CVE-2026-114641: Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round Tripper

• Severity: low (CVSS 3.7 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 2026-10-28
• Weakness: CWE-362

Description

Traefik 2.11.x before 2.11.58 and 3.x before 3.7.14 contains a race condition in NTLM and Kerberos (Negotiate) backend authentication, where the per-connection sticky round tripper slot is read and written without synchronization. Remote attackers can send concurrent HTTP/2 or HTTP/3 requests over one connection to orphan backend connections, break connection-bound authentication, or crash Traefik.

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 — fixed in 2.11.58

How to fix

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

References

• https://github.com/traefik/traefik/security/advisories/GHSA-mhjw-hmjv-p99x
• https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-race-condition-in-ntlm-kerberos-round-tripper

Get alerted when CVE-2026-114641 or the next vulnerability affects your stack