CVE-2026-88007Traefik HTTP/3 Backend NTLM Connection Reuse
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.1 CRITICAL (v4.0, CNA)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
- Weakness (CWE)
- CWE-287, CWE-863
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Sep 10, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
traefik traefik traefik:traefik (from the name) | from 2.11.0, < 2.11.57; from 3.0.0, < 3.7.13 | CNA record |
traefik traefik traefik:traefik | from 2.8.2 before 2.11.56; from 3.0.0 before 3.7.12 | NVD |
References
- https://github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvvx-refsource-confirm, patch, vendor-advisory
- https://github.com/traefik/traefik/pull/13812x-refsource-misc, issue-tracking, patch
- https://github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1cx-refsource-misc, patch
- https://github.com/traefik/traefik/releases/tag/v2.11.57x-refsource-misc, release-notes
- https://github.com/traefik/traefik/releases/tag/v3.7.13x-refsource-misc, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.