CVE-2026-40604 - ClearanceKit: opfilter system extension can be suspended or signalled by a root process, disabling file-access policy enforcement

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HIGH

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

Published Apr 21, 2026

8.2

HIGH

CVSS 4.0

EPSS 0.15%

Description

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.

Affected products

Vendor Craigjbass Product Clearancekit Default
n/a
- Version
  < 5.0.6
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Craigjbass

Clearancekit

n/a

Version	Status	Constraints
< 5.0.6	affected	-

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-693

References (2)

https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-24213
Advisory
https://github.com/craigjbass/clearancekit/security/advisories/GHSA-5r9w-9fg6-266q
x_refsource_CONFIRMVendor Advisory

Link	Providers	Tags
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-24213		Advisory
https://github.com/craigjbass/clearancekit/security/advisories/GHSA-5r9w-9fg6-266q		x_refsource_CONFIRMVendor Advisory