CVE-2026-42512— Remotely triggerable out-of-bounds heap write in dhclient
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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
Source: NVD (National Vulnerability Database)
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
II. Public POCs for CVE-2026-42512
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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
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V. Comments for CVE-2026-42512
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