---
id: CVE-2026-63623
title: >-
  Libvirt: information disclosure via world-readable storage volume images
  during clone/convert
summary: >-
  A flaw was found in libvirt. During storage volume clone or convert
  operations, newly created volume images were temporarily world-readable. This
  was caused by the `qemu-img` utility running with overly permissive file
  creation settings,…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-732
vendor: Red Hat
product: libvirt
affected:
  - libvirt (all versions)
  - libvirt (all versions)
  - libvirt (all versions)
  - 'virt:rhel/libvirt (all versions)'
  - libvirt (all versions)
  - libvirt
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-08-10T18:30:24.800409Z'
published: '2026-08-10'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:53:14.120Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-63623'
references:
  - url: 'https://access.redhat.com/security/cve/CVE-2026-63623'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2513066'
    label: RHBZ#2513066
tags:
  - cve.org
epss: 0.00096
epssPercentile: 0.00664
ingestedAt: '2026-11-05T23:41:31.961Z'
---

## Overview

A flaw was found in libvirt. During storage volume clone or convert operations, newly created volume images were temporarily world-readable. This was caused by the `qemu-img` utility running with overly permissive file creation settings, allowing any local user to read the full guest disk contents. This vulnerability could lead to sensitive information disclosure from guest virtual machines.

## Affected

- `libvirt (all versions)`
- `libvirt (all versions)`
- `libvirt (all versions)`
- `virt:rhel/libvirt (all versions)`
- `libvirt (all versions)`
- `libvirt`

## Remediation

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

### Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.