vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2026-42511

Remote code execution via malicious DHCP options

HIGH
8.1
CVSS Score
Published: April 30, 2026 at 06:56 AM UTC
Updated: June 17, 2026 at 10:47 AM UTC
1 product affected across 1 vendorFreeBSD

Using FreeBSD by FreeBSD?

Get instant alerts when new vulnerabilities affect FreeBSD - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
HIGH8.1
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FreeBSD· Freebsd
95%
13.5-RELEASE ≤ v < p1314.3-RELEASE ≤ v < p1214.4-RELEASE ≤ v < p315.0-RELEASE ≤ v < p713.513.5 beta313.5 p113.5 p1013.5 p1113.5 p1213.5 p213.5 p313.5 p413.5 p513.5 p613.5 p713.5 p813.5 p913.5-RELEASE14.314.3 p114.3 p1014.3 p1114.3 p214.3 p314.3 p414.3 p514.3 p614.3 p714.3 p814.3 p914.3-RELEASE14.414.4 p114.4 p214.4 rc114.4-RELEASE15.015.0 p115.0 p215.0 p315.0 p415.0 p515.0 p615.0-RELEASE
Affected range stops below p12, so it looks safe — our inference, not a vendor statement
Affected range stops below p13, so it looks safe — our inference, not a vendor statement
Affected range stops below p3, so it looks safe — our inference, not a vendor statement
Affected range stops below p7, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor Advisory
Source: cverecord
https://security.freebsd.org/advisories/FreeBSD-SA-26:12.dhclient.asc

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-149

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card