Critical severity9.1NVD Advisory· Published Sep 10, 2026· Updated Sep 14, 2026
CVE-2026-88007
CVE-2026-88007
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.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/traefik/traefik/v3Go | >= 3.0.0, < 3.7.13 | 3.7.13 |
github.com/traefik/traefik/v2Go | >= 2.11.0, < 2.11.57 | 2.11.57 |
Affected products
5- osv-coords2 versionspkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/traefik&distro=openSUSE%20Tumbleweed
< 0.0.20260916T180043-160000.1.1+ 1 more
- (no CPE)range: < 0.0.20260916T180043-160000.1.1
- (no CPE)range: < 3.7.13-1.1
Patches
Vulnerability mechanics
References
7- github.com/traefik/traefik/commit/ff39c47d7459dec9cd8de63c1a4e7aa7315bdc1cnvdPatchWEB
- github.com/traefik/traefik/pull/13812nvdIssue TrackingPatchWEB
- github.com/traefik/traefik/security/advisories/GHSA-qqjf-53cj-pwvvnvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-qqjf-53cj-pwvvghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-88007ghsaADVISORY
- github.com/traefik/traefik/releases/tag/v2.11.57nvdRelease NotesWEB
- github.com/traefik/traefik/releases/tag/v3.7.13nvdRelease NotesWEB
News mentions
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