Vulnerability · Published May 11, 2026 · Assigned by VulnCheck

CVE-2026-34960barebox Out-of-Bounds Read in DHCP Option Parsing

Medium 6.5

In plain English

A medium-severity out-of-bounds read in barebox from barebox. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 83.6% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

barebox prior to version 2026.04.0 contains an out-of-bounds read vulnerability in DHCP option parsing within the dhcp_message_type() function that fails to verify the options pointer remains within received packet bounds. An attacker on the same broadcast domain can send a crafted DHCP Offer or ACK packet without a proper 0xff end marker to cause the parser to read past valid packet data and potentially crash the system.

Affected products (as reported)

Vendor	Product	Versions
barebox	barebox	0 – before 2026.04.0

Weakness: CWE-125 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

https://github.com/barebox/barebox product
https://github.com/barebox/barebox/releases/tag/v2026.04.0 patch
https://www.vulncheck.com/advisories/barebox-out-of-bounds-read-in-dhcp-option-parsing third-party-advisory
Blog Post technical-description