CVE-2026-85594: Traefik

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in the Kubernetes Ingress provider. A namespace-limited tenant excluded from the allowlist can attach an operator-owned middleware to its Service, and if that middleware injects backend credentials, recover them at a controlled backend.

Affected products

• Traefik Traefik: before 3.7.11 (fixed in 3.7.11)

Published 2026-09-04. Last modified 2026-10-08.