Improper access control in FreeBSD - CVE-2026-45254
Published: May 21, 2026
Vulnerability identifier: #VU132012
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45254
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: FreeBSD Foundation
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a local user to extend previously restricted network permissions.
The vulnerability exists due to improper access control in libcap_net when applying a new limitation list that omits keys present in the old limit. A local user can request a new limit with missing keys to extend previously restricted network permissions.
Exploitation is limited to certain scenarios involving Capsicum-sandboxed applications using the cap_net service.
How to mitigate CVE-2026-45254
Install security update from vendor's website.