What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-11 · updated 2026-07-18
• Weakness: CWE-125

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

• barebox: before 2026.04.0 — fixed in 2026.04.0

How to fix

Upgrade to a fixed version: barebox 2026.04.0. Check the vendor advisory for mitigations.

References

• https://github.com/barebox/barebox
• https://github.com/barebox/barebox/releases/tag/v2026.04.0
• https://www.vulncheck.com/advisories/barebox-out-of-bounds-read-in-dhcp-option-parsing
• https://y637f9qq2x.com/posts/barebox-sandbox-vulns/

Get alerted when CVE-2026-34960 or the next vulnerability affects your stack