CVE-2026-40604

MEDIUM

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

Title source: cna

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.

References (1)

[X_Refsource_Confirm] https://github.com/craigjbass/clearancekit/security/advisories/GHSA-5r9w-9fg6-266q

Scores

CVSS v3 4.4

EPSS 0.0002

EPSS Percentile 5.7%

Attack Vector LOCAL

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-693

Status published

Products (1)

craigjbass/clearancekit < 5.0.6 (2 CPE variants)

Published Apr 21, 2026

Tracked Since Apr 21, 2026