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{"bugzilla": {"description": "github.com/traefik/traefik: Traefik HTTP/3 Backend NTLM Connection Reuse", "id": "2531486", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531486"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-863", "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.", "A flaw in Traefik's HTTP/3 ConnContext allows unauthenticated remote attackers to bypass authentication on backends using connection-bound NTLM or Negotiate protocols. Missing service.AddTransportOnContext calls lead to shared kerberosRoundTripper transports, enabling attackers to hijack persistent victim backend connections, read victim-only data, and impersonate victims without credentials."], "mitigation": {"lang": "en:us", "value": "Disable HTTP/3 on Traefik entrypoints handling traffic for backends utilizing NTLM or Negotiate authentication, or disable HTTP/3 globally in the static configuration by removing or setting 'experimental.http3' / entrypoint HTTP/3 settings to false until updated packages are deployed."}, "name": "CVE-2026-88007", "package_state": [{"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "package_name": "devspaces/traefik-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}], "public_date": "2026-09-10T14:47:28Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-88007\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-88007\nhttps://github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1c\nhttps://github.com/traefik/traefik/pull/13812\nhttps://github.com/traefik/traefik/releases/tag/v2.11.57\nhttps://github.com/traefik/traefik/releases/tag/v3.7.13\nhttps://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvv"], "statement": "A flaw in Traefik's HTTP/3 ConnContext allows unauthenticated remote attackers to bypass authentication on backends using connection-bound NTLM or Negotiate protocols. Traefik fails to invoke service.AddTransportOnContext for HTTP/3 entrypoints, causing kerberosRoundTripper to share a single backend transport across distinct frontend connections. Under default security controls, an attacker sending requests over an existing HTTP/3 connection with backend keep-alive enabled can hijack an authenticated victim's persistent backend connection, leading to unauthorized access to sensitive victim data and impersonation without possessing victim credentials.", "threat_severity": "Critical"}