Vulnerability · Published May 11, 2026 · Assigned by VulnCheck

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

Medium 6.2

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 11% of all known vulnerabilities).

Severity (CVSS 3.1)6.2Medium

Exploit odds (30 days)0.2%top 89.1% 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 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 (as reported)

Vendor	Product	Versions
barebox	barebox	0 – before 2026.04.0

Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/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-ext4-extent-parsing-out-of-bounds-read third-party-advisory
Blog Post technical-description