CVE-2026-88007

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.

• CWE-287
• CWE-863

• https://github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1cPatch
• https://github.com/traefik/traefik/pull/13812Issue Tracking, Patch
• https://github.com/traefik/traefik/releases/tag/v2.11.57Release Notes
• https://github.com/traefik/traefik/releases/tag/v3.7.13Release Notes
• https://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvvPatch, Vendor Advisory

Published

Sep 10, 2026

Last Modified

Sep 14, 2026

Status

Analyzed

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