CVE-2026-114642

Traefik before 2.11.58 and 3.7.14 TLS Config Bypass via NTLM/Kerberos Round Tripper

State: Published
Severity: 7.0 High
Published: Oct 22, 2026
Updated: Oct 23, 2026
Reserved: Oct 21, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.0 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N	VulnCheck
3.1	8.7 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N	VulnCheck

Weaknesses

CWE-295 Improper Certificate Validation

Affected Products

Product	Versions
traefiktraefik	2.11.0 to before 2.11.58Affected 2.11.58Not affected
traefiktraefik	3.0.0 to before 3.7.14Affected 3.7.14Not affected

References

GitHub Security Advisory (GHSA-cw35-4q88-3rmp)vendor-advisory
VulnCheck Advisory: Traefik before 2.11.58 and 3.7.14 TLS Config Bypass via NTLM/Kerberos Round Tripperthird-party-advisory

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