CVE-2026-42512

High

Description

As dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers. The code which expands the array incorrectly calculates its new size when requesting memory, resulting in a heap buffer overrun. A specially crafted packet can cause dhclient to overrun its buffer of environment entries. This can result in a crash, but it may be possible to leverage this bug to achieve remote code execution.

SeverityHigh

CVSS8.1

Exploit probability—

Product

Freebsd

PublishedApr 30, 2026

First seenApr 30, 2026

Weakness typeCWE-122CWE-122

How to fix

Vendor advisories

security.freebsd.org/advisories/FreeBSD-SA-26:15.dhclient.asc

Affected products

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

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