CVE-2026-88007

CriticalCVSS 9.1/10Last modified Sep 14, 2026

Description

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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-287 CWE-863

Affected software

Vendor	Product	Versions
traefik	traefik	>= 2.11.0, < 2.11.57; >= 3.0.0, < 3.7.13

References

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

Timeline

Published: Sep 10, 2026
Last modified: Sep 14, 2026
NVD status: Analyzed

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