CVE-2026-42512

Discovered by AISLEPUBLISHEDCWE-122

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.

CVSS Base Scores

CVSS v3.1(Primary)
8.1

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

Affected Products

VendorProductVersionStatus
FreeBSDFreeBSD15.0-RELEASEaffected
FreeBSDFreeBSD14.4-RELEASE—
FreeBSDFreeBSD14.3-RELEASE—
FreeBSDFreeBSD13.5-RELEASE—

Credits

  • Joshua Rogers of AISLE Research Team(finder)

References