PT-2026-36010 · Dhclient+1 · Dhclient+1

Joshua Rogers · Published 2026-04-29 · Updated 2026-05-09 · CVE-2026-42512

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

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

Name of the Vulnerable Software and Affected Versions dhclient (affected versions not specified)

Description When building an environment to pass to dhclient-script, the software may resize the array of string pointers. The code responsible for expanding this array incorrectly calculates the new memory size, leading to a heap buffer overrun (a memory corruption where data is written beyond the boundaries of a heap-allocated buffer). A specially crafted packet can trigger this overrun, potentially causing a system crash or allowing remote code execution.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

CVE-2026-42512

Affected Products

Freebsd

Dhclient

References · 8

• https://security.freebsd.org/advisories/FreeBSD-SA-26:15.dhclient.asc · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-42512 · Security Note
• https://reddit.com/r/freebsd/comments/1sz8nr3/20260429_brings_six_new_security_advisories_three · Reddit Post
• https://t.me/CVEtracker/52299 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2049793016089489906 · Twitter Post
• https://twitter.com/vuldb/status/2049803506102743164 · Twitter Post
• https://freebsd.org/security/advisories/FreeBSD-SA-26:15.dhclient.asc · Note
• https://twitter.com/integ_sec/status/2053086332591772149 · Twitter Post