HIGH 7.0 NVD
CVE-2026-85594
Traefik versions from v3.7.1 fail to enforce crossProviderNamespaces restrictions on the traefik.ingress.kubernetes.io/service.middlewares Service annotation in
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.
References
- https://github.com/traefik/traefik/security/advisories/GHSA-m6wx-622r-48r9
- https://www.vulncheck.com/advisories/traefik-3.7.1-crossprovidernamespaces-bypass-via-serv
This high severity vulnerability with a CVSS score of 7.0 was published on 2026-09-04 via NVD.
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