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High, CVSS 8.2amended

OpenStack Nova calls qemu-img without format restrictions for resize

CVE-2026-24708GHSA-m4f3-qp2w-gwh6

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • PyPI nova

    Affected
    >= 32.0.0.0rc1, <= 32.1.0>= 31.0.0.0rc1, <= 31.2.0<= 30.2.1
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
8.2 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H
EPSS
  • CVE-2026-24708: 0.42% estimated exploitation activity in the next 30 days; percentile 35.96 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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 usecowimages=False) are affected.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-m4f3-qp2w-gwh6

  2. Revision 1 · created ·

    Published from osv record GHSA-m4f3-qp2w-gwh6

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-24708

Advisory: OpenStack Nova calls qemu-img without format restrictions for resize
IDs: CVE-2026-24708, GHSA-m4f3-qp2w-gwh6
Record: https://patchnext.com/advisories/cve-2026-24708 (revision 2, source checked 26 Oct 2026, 13:36 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI nova: affected >= 32.0.0.0rc1, <= 32.1.0; >= 31.0.0.0rc1, <= 31.2.0; <= 30.2.1

## Suggested inspection (read-only)
- `python -m pip show nova`: prints the installed version. Run with the environment that serves production active.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on nova.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-m4f3-qp2w-gwh6 (OSV record GHSA-m4f3-qp2w-gwh6 lists affected ranges: PyPI nova >=32.0.0.0rc1 =31.0.0.0rc1 =0 <=30.2.1)
- Verified: https://github.com/advisories/GHSA-m4f3-qp2w-gwh6 (GitHub-reviewed advisory GHSA-m4f3-qp2w-gwh6 lists affected ranges: PyPI nova >=32.0.0.0rc1 =31.0.0.0rc1 =0 <=30.2.1)

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