Critical severity9.8NVD Advisory· Published Sep 4, 2026· Updated Oct 8, 2026
CVE-2026-85594
CVE-2026-85594
Description
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.
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Affected products
1Patches
Vulnerability mechanics
References
2- github.com/traefik/traefik/security/advisories/GHSA-m6wx-622r-48r9nvdExploitPatchVendor Advisory
- www.vulncheck.com/advisories/traefik-3.7.1-crossprovidernamespaces-bypass-via-service-middlewarenvdThird Party Advisory
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