Input validation error in FreeBSD - CVE-2026-4748
Published: March 30, 2026
Vulnerability identifier: #VU124680
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-4748
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to an error in pf packet filter implementation when handling rules containing the address range syntax (x.x.x.x - y.y.y.y) that only differ in the address ranges. A remote attacker can bypass previously configured rules and gain unauthorized access to the system bypassing packet filtering.
Affected software
FreeBSD
How to mitigate CVE-2026-4748
Install updates from vendor's website.