CVE-2026-40604: ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies

Q: How do I fix CVE-2026-40604?

clearancekit: upgrade to 5.0.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-40604 being exploited?

CVE-2026-40604 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-40604 affect?

CVE-2026-40604 affects clearancekit. Severity is medium (CVSS 4.4). 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 SIGSTO

Q: How urgent is CVE-2026-40604?

Priority 16/100. No elevated risk signals yet.

Routine

MEDIUM 4.4UPGRADE

CVE-2026-40604 is a medium-severity flaw (CVSS 4.4) affecting clearancekit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 ClearanceKi

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.4 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-693
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: craigjbass

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 18:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

craigjbass clearancekit UPGRADE

Affected: < 5.0.6

Fixed in: 5.0.6

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy clearancekit || rpm -q clearancekit || clearancekit --version

2. UPGRADE to 5.0.6 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade clearancekit

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade clearancekit

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-40604?

clearancekit: upgrade to 5.0.6. Exact commands for each OS are on this page.

Is CVE-2026-40604 being exploited?

CVE-2026-40604 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-40604 affect?

CVE-2026-40604 affects clearancekit. Severity is medium (CVSS 4.4). 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 SIGSTO

How urgent is CVE-2026-40604?

Priority 16/100. No elevated risk signals yet.

Software pages

macOS vulnerabilities

Related CVEs

CVE-2026-40599 HIGH 7.1 UPGRADE ClearanceKit intercepts file-system access events on macOS and enforces per-process access policies

References

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