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CVE-2026-42511— Remote code execution via malicious DHCP options

Quick assessment

Affected
FreeBSD FreeBSD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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BOOTP文件字段在写入租约文件时未转义嵌入的双引号，允许注入任意dhclient.conf指令，可能导致恶意DHCP服务器在系统上以root权限执行任意代码。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 4

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p7 affected
14.4-RELEASE< p3 affected
14.3-RELEASE< p12 affected
13.5-RELEASE< p13 affected
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I. Basic Information for CVE-2026-42511

Vulnerability Information
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Vulnerability Title
Remote code execution via malicious DHCP options
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
引号语法转义处理不恰当
Source: CVE Program / CVE List V5
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BOOTP文件字段在写入租约文件时未转义嵌入的双引号，允许注入任意dhclient.conf指令，可能导致恶意DHCP服务器在系统上以root权限执行任意代码。
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

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.0-RELEASE ~ p7 -

II. Public POCs for CVE-2026-42511

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III. Intelligence Information for CVE-2026-42511

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Vendor Advisories for CVE-2026-42511 (1)

Same Patch Batch · FreeBSD · 2026-04-30 · 6 CVEs total

CVE-2026-7164 pf can overflow the stack parsing crafted SCTP packets
CVE-2026-7270 Local privilege escalation via execve()
CVE-2026-42512 Remotely triggerable out-of-bounds heap write in dhclient
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-149

V. Comments for CVE-2026-42511

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