CVE-2026-88007
Fixed in a distro release EPSS <1%CVSS 9.1
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.
Products: traefik
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Go | github.com/traefik/traefik | no fix |
| Go | github.com/traefik/traefik/v2 | 2.11.57 |
| Go | github.com/traefik/traefik/v3 | 3.7.13 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | traefik-3.6 | no fix |
| Chainguard | traefik-fips-3.6 | no fix |
| SUSE Linux Enterprise Server 16.0 | govulncheck-vulndb | 0.0.20260916T180043-160000.1.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | govulncheck-vulndb | 0.0.20260916T180043-160000.1.1 |
| Wolfi | traefik-3.6 | no fix |
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260916T180043-160000.1.1 |
| openSUSE Tumbleweed | traefik | 3.7.13-1.1 |