CVE-2026-42512 — Remotely triggerable out-of-bounds heap write in dhclient

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
FreeBSD / FreeBSD	affected 15.0-RELEASE before p7; affected 14.4-RELEASE before p3; affected 14.3-RELEASE before p12; affected 13.5-RELEASE before p13

CWE

CWE-122

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.