CVE-2026-42511: Freebsd

High severity, CVSS 8.1. EPSS: 0.4% chance of exploitation in the next 30 days.

The BOOTP file field is written to the lease file without escaping embedded double-quotes, allowing injection of arbitrary dhclient.conf directives. When the lease file is subsequently re-parsed by dhclient, e.g., after a system restart, an attacker-controlled field from the lease is passed to dhclient-script(8), which evaluates it. A rogue DHCP server may be able to execute arbirary code as root on a system running dhclient.

Affected products

• Freebsd Freebsd: version 13.5 only; version 14.3 only; version 14.4 only; version 15.0 only

Published 2026-04-30. Last modified 2026-06-17.