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{"bugzilla": {"description": "github.com/traefik/traefik: Traefik: Information disclosure via crossProviderNamespaces bypass in Kubernetes Ingress provider", "id": "2529861", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2529861"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.7", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-1220", "details": ["A flaw was found in Traefik. The software fails to enforce `crossProviderNamespaces` restrictions on the `traefik.ingress.kubernetes.io/service.middlewares` Service annotation within the Kubernetes Ingress provider. This vulnerability allows a namespace-limited tenant, even if excluded from the allowlist, to attach an operator-owned middleware to its Service. If this middleware injects backend credentials, the tenant can then recover these credentials at a controlled backend, leading to information disclosure."], "mitigation": {"lang": "en:us", "value": "Restrict user permissions to modify Service annotations using Kubernetes Admission Controllers or Kyverno policies to prevent unauthorized referencing of traefik.ingress.kubernetes.io/service.middlewares. Alternatively, disable cross-provider namespace resolution in the Traefik Ingress provider configuration until patched."}, "name": "CVE-2026-85594", "package_state": [{"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Not affected", "package_name": "devspaces/traefik-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Not affected", "package_name": "openshift-gitops-1/argo-rollouts-rhel8", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Not affected", "package_name": "openshift-gitops-1/argo-rollouts-rhel9", "product_name": "Red Hat OpenShift GitOps"}], "public_date": "2026-09-04T11:29:58Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-85594\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-85594\nhttps://github.com/traefik/traefik/security/advisories/GHSA-m6wx-622r-48r9\nhttps://www.vulncheck.com/advisories/traefik-3.7.1-crossprovidernamespaces-bypass-via-service-middleware"], "statement": "A flaw was found in Traefik's Kubernetes Ingress provider (v3.7.1 through v3.7.10) where crossProviderNamespaces isolation is not enforced for the service.middlewares Service annotation. In multi-tenant Kubernetes clusters, an authenticated namespace-restricted tenant excluded from cross-namespace allowlists can attach operator-owned middlewares from external namespaces to their Service. If the attached middleware injects upstream backend credentials, the unauthorized tenant can intercept and recover those credentials at a tenant-controlled backend endpoint.", "threat_severity": "Important"}

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