{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.13.0"
              },
              {
                "fixed": "0.13.6"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "c6e109ca46ed7de3a0f371df75e8abc993413a64"
            },
            {
              "fixed": "af2f37793e789b2301da8ed8dfb52ab60affebb6"
            },
            {
              "fixed": "f4085fd13e669141562ec432ce2e020734d77bfa"
            }
          ],
          "repo": "https://github.com/projectcapsule/capsule",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-gwxr-7h77-7777"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55636.json"
  },
  "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.",
  "id": "CVE-2026-55636",
  "modified": "2026-09-17T03:30:53.399068336Z",
  "published": "2026-09-15T15:27:44.731Z",
  "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"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Capsule: Incomplete fix of CVE-2026-30963: singular/plural typo leaves namespaces/finalize unprotected"
}