---
id: CVE-2026-120740
title: >-
  Hivex: hivex: denial of service via out-of-bounds read in big-data block
  processing
summary: >-
  A flaw was found in hivex. By supplying a specially crafted Windows registry
  hive file, an attacker can trigger an out-of-bounds memory read when hivex
  parses registry values containing malformed large data block lists. This issue
  can ca…
severity: low
cvss: 2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:L'
cvssSource: cna
cwe:
  - CWE-125
vendor: Red Hat
product: hivex
affected:
  - hivex (all versions)
  - hivex (all versions)
  - hivex (all versions)
  - 'virt-devel:rhel/hivex (all versions)'
  - 'virt:rhel/hivex (all versions)'
  - hivex (all versions)
published: '2026-11-02'
updated: '2026-11-02'
sourceUpdated: '2026-11-02T22:15:26.318Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120740'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-120740'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2565405'
    label: RHBZ#2565405
tags:
  - cve.org
epss: 0.00237
epssPercentile: 0.14847
ingestedAt: '2026-11-05T19:30:42.872Z'
---

## Overview

A flaw was found in hivex. By supplying a specially crafted Windows registry hive file, an attacker can trigger an out-of-bounds memory read when hivex parses registry values containing malformed large data block lists. This issue can cause the application processing the registry file to crash, resulting in a Denial of Service (DoS).

## Affected

- `hivex (all versions)`
- `hivex (all versions)`
- `hivex (all versions)`
- `virt-devel:rhel/hivex (all versions)`
- `virt:rhel/hivex (all versions)`
- `hivex (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.