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

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于扩展环境条目数组时错误计算新大小，导致堆缓冲区溢出，可能导致崩溃或远程代码执行。

AI Predicted 7.5 Difficulty: Easy EPSS 1.81% · P78

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p7 affected
14.4-RELEASE< p3 affected
14.3-RELEASE< p12 affected
13.5-RELEASE< p13 affected
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I. Basic Information for CVE-2026-42512

Vulnerability Information
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Vulnerability Title
Remotely triggerable out-of-bounds heap write in dhclient
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于扩展环境条目数组时错误计算新大小，导致堆缓冲区溢出，可能导致崩溃或远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.0-RELEASE ~ p7 -

II. Public POCs for CVE-2026-42512

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III. Intelligence Information for CVE-2026-42512

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Vendor Advisories for CVE-2026-42512 (1)

Same Patch Batch · FreeBSD · 2026-04-30 · 6 CVEs total

CVE-2026-42511 Remote code execution via malicious DHCP options
CVE-2026-7164 pf can overflow the stack parsing crafted SCTP packets
CVE-2026-7270 Local privilege escalation via execve()
CVE-2026-35547 Heap overflow in libnv
CVE-2026-39457 Stack overflow via select() file descriptor set overflow

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-122

V. Comments for CVE-2026-42512

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