---
id: CVE-2026-34962
title: >-
  barebox version prior to 2026.04.0 contains a denial-of-service vulnerability
  in ext4 directory parsing in fs/ext4/ext4_common.c where the
  ext4fs_iterate_dir() function fails to validate that directory entry length
  values are non-zero
summary: >-
  barebox version prior to 2026.04.0 contains a denial-of-service vulnerability
  in ext4 directory parsing in fs/ext4/ext4_common.c where the
  ext4fs_iterate_dir() function fails to validate that directory entry length
  values are non-zero. A…
severity: medium
cvss: 6.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-835
vendor: pengutronix
product: barebox
affected:
  - barebox < 2026.04.0
patched:
  - barebox 2026.04.0
published: '2026-05-11'
updated: '2026-07-18'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-34962'
references:
  - url: 'https://github.com/barebox/barebox'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/barebox/barebox/releases/tag/v2026.04.0'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/barebox-ext4-directory-parsing-infinite-loop-denial-of-service
    label: disclosure@vulncheck.com
  - url: 'https://y637f9qq2x.com/posts/barebox-sandbox-vulns/'
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00129
epssPercentile: 0.02958
ingestedAt: '2026-07-18T03:20:40.221Z'
---

## Overview

barebox version prior to 2026.04.0 contains a denial-of-service vulnerability in ext4 directory parsing in fs/ext4/ext4_common.c where the ext4fs_iterate_dir() function fails to validate that directory entry length values are non-zero. Attackers can supply a malicious ext4 filesystem image with a crafted directory entry containing a direntlen value of 0 to cause an infinite loop during directory listing or path resolution, resulting in the boot process hanging indefinitely.

## Affected

- `barebox < 2026.04.0`

## Remediation

Upgrade past the affected range:

- `barebox 2026.04.0`