| Package | Affected versions | Patched versions |
|---|---|---|
| traefik | ≥ 2.11.0, < 2.11.58≥ 3.0.0, < 3.7.14 | 2.11.583.7.14 |
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.
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