{"id":"CVE-2026-55636","summary":"Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected","details":"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.","aliases":["GHSA-gwxr-7h77-7777","GO-2026-5406"],"modified":"2026-09-17T03:47:27.131491323Z","published":"2026-09-15T15:27:44.731Z","related":["openSUSE-SU-2026:21483-1"],"database_specific":{"cwe_ids":["CWE-863"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55636.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/projectcapsule/capsule/releases/tag/v0.13.6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55636.json"},{"type":"ADVISORY","url":"https://github.com/projectcapsule/capsule/security/advisories/GHSA-gwxr-7h77-7777"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55636"},{"type":"FIX","url":"https://github.com/projectcapsule/capsule/commit/af2f37793e789b2301da8ed8dfb52ab60affebb6"},{"type":"FIX","url":"https://github.com/projectcapsule/capsule/pull/1966"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/projectcapsule/capsule","events":[{"introduced":"c6e109ca46ed7de3a0f371df75e8abc993413a64"},{"fixed":"af2f37793e789b2301da8ed8dfb52ab60affebb6"},{"fixed":"f4085fd13e669141562ec432ce2e020734d77bfa"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0.13.0"},{"fixed":"0.13.6"}]}}],"versions":["v0.13.5","v0.13.4","v0.13.3","v0.13.2","v0.13.1","v0.13.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55636.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L"}]}