{"id":"CVE-2026-55636","revision":null,"records":[{"revision":"cea693c6f9bb40d1a28a9b9294e5bdf2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-55636","aliases":[],"title":"Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected","description":"Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name namespaces/finalize. A user with namespaces/finalize RBAC can send a PUT request to /api/v1/namespaces/{namespace}/finalize, and the singular rule never matches the plural resource, so the validating webhook is not invoked and the user can change the namespace tenant label. matchPolicy: Equivalent does not compensate because it handles API group and version equivalence rather than resource-name errors. This vulnerability is fixed in 0.13.6.","state":0,"publishedAt":"2026-09-15T15:27:44.731+00:00","modifiedAt":"2026-09-15T18:02:29.068+00:00","affected":[{"ecosystem":"Vendor product","name":"capsule","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"projectcapsule\",\n                    \"product\": \"capsule\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 0.13.0, < 0.13.6\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L","score":5.7,"severity":"MEDIUM"}],"references":["https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777","https://github.com/projectcapsule/capsule/pull/1966","https://github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab60affebb6","https://github.com/projectcapsule/capsule/releases/tag/v0.13.6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-55636","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-55636","identifiers":["CVE-2026-55636"]},"retained":false,"historicalAffected":[]},{"revision":"489a965667fc4ed59f67c3e89fafd276","observedAt":"2026-11-11T14:03:27.297+00:00","statement":{"source":"euvd","id":"EUVD-2026-78670","aliases":["CVE-2026-55636","GHSA-gwxr-7h77-7777"],"title":"Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name na…","description":"Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name namespaces/finalize. A user with namespaces/finalize RBAC can send a PUT request to /api/v1/namespaces/{namespace}/finalize, and the singular rule never matches the plural resource, so the validating webhook is not invoked and the user can change the namespace tenant label. matchPolicy: Equivalent does not compensate because it handles API group and version equivalence rather than resource-name errors. This vulnerability is fixed in 0.13.6.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L","score":5.7,"severity":null}],"references":["https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777","https://github.com/projectcapsule/capsule/pull/1966","https://github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab60affebb6","https://github.com/projectcapsule/capsule/releases/tag/v0.13.6"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-78670","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Sep 15, 2026, 3:27:44 PM","dateUpdated":"Sep 15, 2026, 6:02:29 PM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-78670","identifiers":["EUVD-2026-78670","CVE-2026-55636","GHSA-gwxr-7h77-7777"]},"retained":false,"historicalAffected":[]},{"revision":"d2dab3a8c8b7436da542ce5366840720","observedAt":"2026-10-25T14:19:05.298+00:00","statement":{"source":"nvd","id":"CVE-2026-55636","aliases":[],"title":"Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name na…","description":"Capsule is a multi-tenancy and policy-based framework for Kubernetes. From 0.13.0 until 0.13.6, charts/capsule/templates/configuration.yaml configures the validating webhook with namespace/finalize instead of the Kubernetes resource name namespaces/finalize. A user with namespaces/finalize RBAC can send a PUT request to /api/v1/namespaces/{namespace}/finalize, and the singular rule never matches the plural resource, so the validating webhook is not invoked and the user can change the namespace tenant label. matchPolicy: Equivalent does not compensate because it handles API group and version equivalence rather than resource-name errors. This vulnerability is fixed in 0.13.6.","state":0,"publishedAt":"2026-09-15T16:17:14.99+00:00","modifiedAt":"2026-09-30T17:51:56.193+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L","score":5.7,"severity":"MEDIUM"}],"references":["https://github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab60affebb6","https://github.com/projectcapsule/capsule/pull/1966","https://github.com/projectcapsule/capsule/releases/tag/v0.13.6","https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55636","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-863"],"productCriteria":[],"sourceDates":{"published":"2026-09-15T16:17:14.990","lastModified":"2026-09-30T17:51:56.193"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-55636","identifiers":["CVE-2026-55636"]},"retained":false,"historicalAffected":[]},{"revision":"c552730986d44a5da5f47f46f47bc8b7","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GHSA-gwxr-7h77-7777","aliases":["CVE-2026-55636","GO-2026-5406"],"title":"Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected","description":"### Summary\nCapsule v0.13.2 webhook rules contain `namespace/finalize` (singular) instead of `namespaces/finalize` (plural). K8s requires plural. The finalize defense from CVE-2026-30963 fix is absent.\n\n### Details\nPUT to `/api/v1/namespaces/<ns>/finalize` has resource=namespaces (plural). The singular rule never matches. `matchPolicy: Equivalent` does not compensate.\n\n### PoC\nConfirmed on kind + Capsule v0.13.2. alice (non-admin with namespaces/finalize RBAC): `kubectl label --as=alice` = DENIED (control). `kubectl replace --raw /finalize --as=alice` = 200 OK (bypass). Tenant label changed.\n\n### Impact\nNamespace tenant-label hijack. Same threat model as CVE-2026-30963. One-char fix: `namespace/finalize` -> `namespaces/finalize`.\nThe CVE-2026-30963 fix in Capsule v0.13.2 added subresource entries to the namespace validating webhook, but `charts/capsule/templates/configuration.yaml` line 105 contains a singular/plural typo: `namespace/finalize` instead of `namespaces/finalize`. Kubernetes webhook rules require the plural resource name. The finalize subresource defense is entirely absent.\n\n### Details\nIn Kubernetes admission webhooks, `rules.resources` matches against the plural resource name. A PUT to `/api/v1/namespaces/<ns>/finalize` has `resource=namespaces` (plural). The rule `namespace/finalize` (singular) never matches any real API request.\n\nThe `matchPolicy: Equivalent` setting does NOT compensate (it handles API group/version variations, not resource name typos).\n\n### PoC\nConfirmed on kind cluster + Capsule v0.13.2 (Helm chart):\n```bash\n# Setup: alice with namespaces/finalize RBAC\nkubectl apply -f - <<EOF\napiVersion: rbac.authorization.k8s.io/v1\nkind: ClusterRole\nmetadata:\n  name: ns-finalize-updater\nrules:\n- apiGroups: [\"\"]\n-   resources: [\"namespaces/finalize\"]\n-   verbs: [\"update\"]\n- - apiGroups: [\"\"]\n-   resources: [\"namespaces\"]\n-   verbs: [\"get\", \"list\"]\n- EOF\n- kubectl create clusterrolebinding alice-finalize --clusterrole=ns-finalize-updater --user=alice\n# Control: normal label change DENIED\nkubectl label namespace oil-prod capsule.clastix.io/tenant=evil --overwrite --as=alice\n# Error: admission webhook denied\n\n# Bypass: finalize changes tenant label (webhook NOT invoked)\nkubectl get namespace oil-prod -o json > /tmp/ns.json\n# modify tenant label to \"hijacked\"\nkubectl replace --raw \"/api/v1/namespaces/oil-prod/finalize\" -f /tmp/ns_modified.json --as=alice\n# 200 OK - tenant label changed\n```\n\n### Impact\nNamespace tenant-label hijack via the finalize subresource bypass. Same threat model as CVE-2026-30963. One-character fix needed: `namespace/finalize` -> `namespaces/finalize`.","state":0,"publishedAt":"2026-06-17T18:14:12+00:00","modifiedAt":"2026-06-25T23:11:05.4098359+00:00","affected":[{"ecosystem":"Go","name":"github.com/projectcapsule/capsule","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.13.0"},{"kind":"fixed","version":"0.13.6"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777","https://github.com/projectcapsule/capsule"],"sourceUrl":"https://github.com/advisories/GHSA-gwxr-7h77-7777","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-gwxr-7h77-7777","identifiers":["GHSA-gwxr-7h77-7777","CVE-2026-55636","GO-2026-5406"]},"retained":false,"historicalAffected":[]},{"revision":"5c684eed0c024ab9b9e110b140fec514","observedAt":"2026-10-24T13:19:41.952+00:00","statement":{"source":"osv","id":"GO-2026-5406","aliases":["CVE-2026-55636","GHSA-gwxr-7h77-7777"],"title":"Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected in github.com/projectcapsule/capsule","description":"Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected in github.com/projectcapsule/capsule","state":0,"publishedAt":"2026-06-25T22:34:31+00:00","modifiedAt":"2026-06-25T23:00:16.1212049+00:00","affected":[{"ecosystem":"Go","name":"github.com/projectcapsule/capsule","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.13.0"},{"kind":"fixed","version":"0.13.6"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[],"references":["https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777"],"sourceUrl":"https://osv.dev/vulnerability/GO-2026-5406","license":"OSV · upstream source license applies","key":"osv:GO-2026-5406","identifiers":["GO-2026-5406","CVE-2026-55636","GHSA-gwxr-7h77-7777"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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