Vulnerability Details CVE-2026-42512
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 26.4%
CVSS Severity
CVSS v3 Score 8.1