Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0 until 2.11.57 and 3.7.13, the HTTP/3 entrypoint ConnContext does not call service.AddTransportOnContext, so kerberosRoundTripper uses a shared backend transport instead of a transport dedicated to each frontend connection. With HTTP/3 enabled, a backend using connection-bound NTLM or Negotiate authentication, and backend keep-alive, an unrelated client can reuse a backend connection authenticated for a victim, read victim-only data, and act as that victim without the victim credentials. This issue is fixed in 2.11.57 and 3.7.13.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Traefik is an open source HTTP reverse proxy and load balancer. From 2.11.0 until 2.11.57 and 3.7.13, the
    HTTP/3 entrypoint ConnContext does not call service.AddTransportOnContext, so kerberosRoundTripper uses a
    shared backend transport instead of a transport dedicated to each frontend connection. With HTTP/3
    enabled, a backend using connection-bound NTLM or Negotiate authentication, and backend keep-alive, an
    unrelated client can reuse a backend connection authenticated for a victim, read victim-only data, and act
    as that victim without the victim credentials. This issue is fixed in 2.11.57 and 3.7.13. (CVE-2026-88007)

ID	Name	Product	Family	Type	Severity
460347	Echo: github.com/traefik/traefik/v3: security update to 2.11.57	Tenable Cloud Security	Echo Local Security Checks	Local	critical
460347	Echo: github.com/traefik/traefik/v3: security update to 2.11.57	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	critical
447915	SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-qqjf-53cj-pwvv)	Tenable Cloud Security	SCA Checks	Local	critical
447915	SCA: security update for github.com/traefik/traefik/v2, github.com/traefik/traefik/v3 (GHSA-qqjf-53cj-pwvv)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical

Detections

Analytics

CVE-2026-88007

critical

Tenable Plugins

critical

critical

critical

critical