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CVE PROGRAM SOURCE RECORD8.1 High

CVE-2026-42512

Remotely triggerable out-of-bounds heap write in dhclient

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Status
Published
Published
Updated
Assigning organization
freebsd

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

FreeBSD FreeBSD

Default version status: unknown

  • 15.0-RELEASE to < p7affected
  • 14.4-RELEASE to < p3affected
  • 14.3-RELEASE to < p12affected
  • 13.5-RELEASE to < p13affected

References