What’s Vulnerable › Vulnerabilities

CVE-2026-114642: Traefik before 2.11.58 and 3.7.14 TLS Config Bypass via NTLM/Kerberos Round Tripper

• Severity: high (CVSS 8.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% 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-295

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.

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-cw35-4q88-3rmp
• https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.14-tls-config-bypass-via-ntlm-kerberos-round-tripper

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