Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

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

High 8.2

In plain English

A high-severity security flaw in clearancekit from craigjbass. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).

Severity (CVSS 4.0)8.2High

Exploit odds (30 days)0.1%top 98.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
craigjbass	clearancekit	< 5.0.6

Weakness: CWE-693 · Vector: 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

References

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