ClearanceKit: Ad-hoc signed binaries can spoof Apple process identities in the global allowlist

{
  "id": "7d6d8209b7a4113e9d159786259bbb78b8764f87a10529a190b55b92b8880b3c",
  "url": "https://osv.dev/vulnerability/CVE-2026-40599",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ClearanceKit: Ad-hoc signed binaries can spoof Apple process identities in the global allowlist",
    "summary": "ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. Prior to 5.0.5, ClearanceKit incorrectly treats a process with an empty Team ID and a non-empty Signing ID as an Apple platform binary. This bug allows a malicious software to impersonate an apple process in the global allowlist, and access all protected files. This vulnerability is fixed in 5.0.5.",
    "evidence": "osv:CVE-2026-40599",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-40599",
      "aliases": [
        "CVE-2026-40599",
        "GHSA-w253-42qp-5f2x"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/craigjbass/clearancekit",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "caaf6731fcf1dbf8248f41ee58657c8aa1dd57d2"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.0.5"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "cpe": "cpe:2.3:a:craigjbass:clearancekit:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "5.0.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-40599.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.157224876Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40599.json",
        "https://github.com/craigjbass/clearancekit/security/advisories/GHSA-w253-42qp-5f2x",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-40599"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-863"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40599.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-40599",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514209,
  "published_at": "2026-04-21T17:37:05.064+00:00"
}