# CVE-2026-42511

## Summary

- **CVE ID:** CVE-2026-42511
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-149
- **Published:** Apr 30, 2026
- **Last Modified:** May 1, 2026

## Description

The BOOTP file field is written to the lease file without escaping embedded double-quotes, allowing injection of arbitrary dhclient.conf directives.  When the lease file is subsequently re-parsed by dhclient, e.g., after a system restart, an attacker-controlled field from the lease is passed to dhclient-script(8), which evaluates it.

A rogue DHCP server may be able to execute arbirary code as root on a system running dhclient.

## Affected Products

- FreeBSD — FreeBSD (15.0-RELEASE)
- FreeBSD — FreeBSD (14.4-RELEASE)
- FreeBSD — FreeBSD (14.3-RELEASE)
- FreeBSD — FreeBSD (13.5-RELEASE)

## References

- [CNA](https://security.freebsd.org/advisories/FreeBSD-SA-26:12.dhclient.asc)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.43%
- **EPSS Percentile:** 36.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._