Vulnerability-Lookup

CVE-2026-40604 (GCVE-0-2026-40604)

Vulnerability from cvelistv5 – Published: 2026-04-21 17:41 – Updated: 2026-04-21 20:36

Title

ClearanceKit: opfilter system extension can be suspended or signalled by a root process, disabling file-access policy enforcement

Summary

ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies. Prior to 5.0.6, the opfilter Endpoint Security system extension (bundle ID uk.craigbass.clearancekit.opfilter) can be suspended with SIGSTOP or kill -STOP, or killed with SIGKILL/SIGTERM, by any process running as root. While the extension is suspended, all AUTH Endpoint Security events time out and default to allow, silently disabling ClearanceKit's file-access policy enforcement for the duration of the suspension. This vulnerability is fixed in 5.0.6.

Severity

8.2 (High)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:H/SI:H/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 19:55 UTC

CWE

CWE-693 - Protection Mechanism Failure

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://github.com/craigjbass/clearancekit/securi…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version	CPE status
craigjbass	clearancekit	Affected: < 5.0.6	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-40604

Vulnerability from fkie_nvd - Published: 2026-04-21 18:16 - Updated: 2026-06-17 10:45

Severity

4.4 (Medium) - CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/craigjbass/clearancekit/security/advisories/GHSA-5r9w-9fg6-266q	Vendor Advisory

Impacted products

	Vendor	Product	Version
	craigjbass	clearancekit	*
	apple	macos	-

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "clearancekit",
          "vendor": "craigjbass",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.0.6"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
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    }
  ],
  "id": "CVE-2026-40604",
  "lastModified": "2026-06-17T10:45:31.340",
  "metrics": {
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          "integrityImpact": "NONE",
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          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.