{"id":"CVE-2026-85594","title":"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","summary":"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 th…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-639","CWE-1220"],"vendor":"traefik","product":"traefik","affected":["traefik < 3.7.11"],"patched":["traefik 3.7.11"],"published":"2026-09-04","updated":"2026-09-16","sourceUpdated":"2026-09-16T20:42:53.890","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-85594","references":[{"url":"https://github.com/traefik/traefik/security/advisories/GHSA-m6wx-622r-48r9","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/traefik-3.7.1-crossprovidernamespaces-bypass-via-service-middleware","label":"disclosure@vulncheck.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85594.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-85594"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2529861"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-85594"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-85594"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00262,"epssPercentile":0.18337,"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-08T14:47:22.510684Z"},"scores":{"nvd":9.8,"cna":7,"vendor":7.7},"ingestedAt":"2026-09-08T15:33:26.960Z","slug":"CVE-2026-85594","body":"## Overview\n\nTraefik 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.\n\n## Affected\n\n- `traefik < 3.7.11`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `traefik 3.7.11`\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85594.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":205761,"id":"CVE-2026-85594","ts":1789592771922,"field":"cvss","old":"7","new":"9.8"},{"seq":205760,"id":"CVE-2026-85594","ts":1789592771922,"field":"severity","old":"high","new":"critical"}]}