{"id":"CVE-2026-88007","summary":"Traefik HTTP/3 Backend NTLM Connection Reuse","details":"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.","aliases":["GHSA-qqjf-53cj-pwvv"],"modified":"2026-09-12T03:47:21.122031038Z","published":"2026-09-10T14:47:28.270Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88007.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-287","CWE-863"]},"references":[{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v2.11.57"},{"type":"WEB","url":"https://github.com/traefik/traefik/releases/tag/v3.7.13"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88007.json"},{"type":"ADVISORY","url":"https://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvv"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88007"},{"type":"FIX","url":"https://github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1c"},{"type":"FIX","url":"https://github.com/traefik/traefik/pull/13812"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/traefik/traefik","events":[{"introduced":"0c8778639a3cade0cf73aa26f56f822a4fb835e8"},{"introduced":"d99d2f95e66a28ee8180634dc80fdf13ba68c62a"},{"fixed":"839eb7f48a16849f22762b7e3bdfc58253146cd7"},{"fixed":"fc92cc118a0557a029c7019d5ee06665127b0f13"},{"fixed":"ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1c"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"2.11.0"},{"fixed":"2.11.57"},{"introduced":"3.0.0"},{"fixed":"3.7.13"}]}}],"versions":["v2.11.56","v2.11.55","v2.11.54","v2.11.53","v2.11.52","v2.11.51","v2.11.50","v2.11.49","v2.11.48","v2.11.47","v2.11.46","v2.11.45","v2.11.44","v2.11.43","v2.11.42","v2.11.41","v2.11.40","v2.11.39","v2.11.38","v2.11.37","v2.11.36","v2.11.35","v2.11.34","v2.11.33","v2.11.32","v2.11.31","v2.11.30","v2.11.29","v2.11.28","v2.11.27","v2.11.26","v2.11.25","v2.11.24","v2.11.23","v2.11.22","v2.11.21","v2.11.20","v2.11.19","v2.11.18","v2.11.17","v2.11.16","v2.11.15","v2.11.14","v2.11.13","v2.11.12","v2.11.11","v2.11.10","v2.11.9","v2.11.8","v2.11.7","v2.11.6","v2.11.5","v2.11.4","v2.11.3","v2.11.2","v2.11.1","v2.11.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88007.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"}]}