# CVE-2026-42512

> Vulnerability · severity: **HIGH** (CVSS 8.1).

## 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.

## Key facts

- **CVE ID:** CVE-2026-42512
- **Published:** 2026-04-30
- **CVSS severity:** HIGH
- **CVSS base score:** 8.1
- **CWE codes:** CWE-122

## Affected products

- `freebsd:freebsd`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42512

## Citation

> AI Analytics. CVE-2026-42512. Retrieved 2026-07-23 from https://api.ai-analytics.org/cve/CVE-2026-42512. Derived from NIST NVD. Licensed CC0.

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