---
id: CVE-2026-24708
title: >-
  An issue was discovered in OpenStack Nova before 30.2.2, 31 before 31.2.1, and
  32 before 32.1.1
summary: >-
  An issue was discovered in OpenStack Nova before 30.2.2, 31 before 31.2.1, and
  32 before 32.1.1. By writing a malicious QCOW header to a root or ephemeral
  disk and then triggering a resize, a user may convince Nova's Flat image
  backend t…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H'
cwe:
  - CWE-669
  - CWE-73
vendor: OpenStack
product: Nova
affected:
  - Nova < 30.2.2
  - Nova >= 31.0.0 < 31.2.1
  - Nova >= 32.0.0 < 32.1.1
patched:
  - openstack_platform 16.2
  - openstack_platform 17.1
  - openstack_services_on_openshift 18.0
published: '2026-02-18'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T13:17:13.113'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-24708'
references:
  - url: 'https://bugs.launchpad.net/nova/+bug/2137507'
    label: cve@mitre.org
  - url: 'https://www.openwall.com/lists/oss-security/2026/02/17/7'
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2026/02/msg00025.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2026:54757'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:66401'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:7884'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-24708'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2430312'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24708.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-24708'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-24708'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-02-19T19:07:53.345297Z'
epss: 0.00381
epssPercentile: 0.29215
scores:
  nvd: 8.2
  vendor: 7.1
  cna: 8.2
ingestedAt: '2026-07-03T18:53:52.434Z'
---

## Overview

An issue was discovered in OpenStack Nova before 30.2.2, 31 before 31.2.1, and 32 before 32.1.1. By writing a malicious QCOW header to a root or ephemeral disk and then triggering a resize, a user may convince Nova's Flat image backend to call qemu-img without a format restriction, resulting in an unsafe image resize operation that could destroy data on the host system. Only compute nodes using the Flat image backend (usually configured with use_cow_images=False) are affected.

## Remediation

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

## Vendor advisories

- **RHSA-2026:54757** · Red Hat · fixed in: Red Hat OpenStack Platform 16.2 · released 2026-08-13 · [advisory](https://access.redhat.com/errata/RHSA-2026:54757)
- **RHSA-2026:66401** · Red Hat · fixed in: Red Hat OpenStack Platform 17.1 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66401)
- **RHSA-2026:7884** · Red Hat · fixed in: Red Hat OpenStack Services on OpenShift 18.0 · released 2026-04-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:7884)
- **Red Hat VEX** · Important · affected: Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0 · no fix planned: Red Hat OpenStack Platform 13 (Queens), Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1, Red Hat OpenStack Platform 18.0 · updated 2026-09-10 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24708.json)