{"id":"CVE-2026-88007","title":"Traefik is an open source HTTP reverse proxy and load balancer","summary":"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 …","severity":"critical","cvss":9.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","cwe":["CWE-287","CWE-863"],"vendor":"traefik","product":"traefik","affected":["traefik >= 2.8.2, < 2.11.56","traefik >= 3.0.0, < 3.7.12"],"patched":["traefik 3.7.12"],"published":"2026-09-10","updated":"2026-09-14","sourceUpdated":"2026-09-14T19:58:52.257","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88007","references":[{"url":"https://github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1c","label":"security-advisories@github.com"},{"url":"https://github.com/traefik/traefik/pull/13812","label":"security-advisories@github.com"},{"url":"https://github.com/traefik/traefik/releases/tag/v2.11.57","label":"security-advisories@github.com"},{"url":"https://github.com/traefik/traefik/releases/tag/v3.7.13","label":"security-advisories@github.com"},{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvv","label":"security-advisories@github.com"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88007"},{"url":"https://github.com/traefik/traefik"}],"tags":["nvd","cve.org","osv","go"],"epss":0.00331,"epssPercentile":0.26436,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-09-10T15:38:41.123784Z"},"ingestedAt":"2026-09-11T10:30:26.776Z","aliases":["GHSA-qqjf-53cj-pwvv","GO-2026-6466"],"ecosystem":"go","slug":"CVE-2026-88007","body":"## Overview\n\nTraefik 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.\n\n## Affected\n\n- `traefik >= 2.8.2, < 2.11.56`\n- `traefik >= 3.0.0, < 3.7.12`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `traefik 3.7.12`\n\n## Package advisory (CVE-2026-88007)\n\nAffected packages:\n\n- `github.com/traefik/traefik/v3 >= 3.0.0, < 3.7.13`\n- `github.com/traefik/traefik/v2 >= 2.11.0, < 2.11.57`\n\nPatched in:\n\n- `github.com/traefik/traefik/v3 3.7.13`\n- `github.com/traefik/traefik/v2 2.11.57`\n\nSource: https://osv.dev/vulnerability/GHSA-qqjf-53cj-pwvv","depth":"midnight","depthScore":50,"depthScoreParts":{"impact":50.1,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}