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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.

PUBLISHED Reserved 2026-03-31 | Published 2026-05-11 | Updated 2026-05-11 | Assigner VulnCheck




MEDIUM: 6.5CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

HIGH: 7.1CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-125 Out-of-bounds Read

Product status

Default status
unaffected

Any version
affected

Credits

Kazuma Matsumoto finder

References

github.com/barebox/barebox product

github.com/barebox/barebox/releases/tag/v2026.04.0 patch

www.vulncheck.com/...t-of-bounds-read-in-dhcp-option-parsing third-party-advisory

cve.org (CVE-2026-34960)

nvd.nist.gov (CVE-2026-34960)

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