CVE-2026-42511

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.

Scoring

Severity

HIGH

CVSS base score

8.1

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS probability

0.43%

CWE

CWE-149

Published

2026-04-30

Last modified

2026-05-01

Affected products

• FreeBSD FreeBSD
• FreeBSD FreeBSD
• FreeBSD FreeBSD
• FreeBSD FreeBSD

Weakness type

• CWE-149

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