Out-of-bounds Read in Barebox
CVE-2026-34960
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.004 (30.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 30.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Barebox — versions 0
- Pengutronix Barebox
Weakness classification (CWE)
References
- github.com/barebox/barebox (Product, product)
- github.com/barebox/barebox/releases/tag/v2026.04.0 (Release Notes, patch)
- www.vulncheck.com/advisories/barebox-out-of-bounds-read-in-dhcp-option-parsing (Third Party Advisory, third-party-advisory)
- y637f9qq2x.com/posts/barebox-sandbox-vulns/ (technical-description)
Frequently asked questions
- What is CVE-2026-34960?
- CVE-2026-34960 is a medium-severity vulnerability in Barebox, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2026-05-11.
- How severe is CVE-2026-34960?
- Medium severity. CVSS v3 base score is 6.5 out of 10.