CVE-2026-42511

High

Description

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.

SeverityHigh

CVSS8.1

Exploit probability—

Product

Freebsd

PublishedApr 30, 2026

First seenApr 30, 2026

Weakness typeCWE-149CWE-149

How to fix

Vendor advisories

security.freebsd.org/advisories/FreeBSD-SA-26:12.dhclient.asc

Affected products

Product	Affected versions	Fixed in
freebsd freebsd	13.5, 14.3, 14.4, 15.0	—

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