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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)
Affected Products
VendorProductAffected VersionsCPESubscribe
FreeBSDFreeBSD 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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IV. Related Vulnerabilities
V. Comments for CVE-2026-42512

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