What’s Vulnerable › Vulnerabilities

CVE-2026-34961: barebox ext4 Extent Parsing Out-of-Bounds Read

• Severity: high (CVSS 7.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% 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 out-of-bounds read vulnerabilities in ext4 extent parsing due to missing validation of the eh_entries field against buffer capacity in fs/ext4/ext4_common.c. Attackers can supply a malicious ext4 filesystem image via USB, SD card, or network boot to trigger heap out-of-bounds reads during boot-time filesystem parsing, potentially redirecting reads to arbitrary disk offsets.

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-ext4-extent-parsing-out-of-bounds-read
• https://y637f9qq2x.com/posts/barebox-sandbox-vulns/

Get alerted when CVE-2026-34961 or the next vulnerability affects your stack