CVSS 8.7 (high) · published 2026-10-22
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 (NVD): traefik traefik
Fixed in (NVD): 2.11.58, 3.7.14
Weakness: CWE-295
Source: NVD CVE-2026-114642
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