CVE-2026-88007
Traefik HTTP/3 Backend NTLM Connection Reuse
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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 | CWE-287 CWE-863 |
| Vendor | traefik |
| Product | traefik |
| Published | Sep 10, 2026 |
| Last Updated | Sep 10, 2026 |
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Affected Versions
traefik / traefik
>= 2.11.0, < 2.11.57 >= 3.0.0, < 3.7.13
References
github.com: https://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvv github.com: https://github.com/traefik/traefik/pull/13812 github.com: https://github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1c github.com: https://github.com/traefik/traefik/releases/tag/v2.11.57 github.com: https://github.com/traefik/traefik/releases/tag/v3.7.13