CVE-2026-114642

High

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.

SeverityHigh

CVSS8.7

Exploit probability—

Product

Traefik

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-295CWE-295

How to fix

Update

traefik traefik2.11.58, 3.7.14 or later

Vendor advisories

github.com/traefik/traefik/security/advisories/GHSA-cw35-4q88-3rmp

Affected products

Product	Affected versions	Fixed in
traefik traefik	2.11.0 ≤ v < 2.11.58, 3.0.0 ≤ v < 3.7.14	2.11.58, 3.7.14

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