CVE-2026-24708
nova - security update
8.2
HIGH
CVSS 3.1
EPSS 0.02%
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.
How to fix CVE-2026-24708
To remediate CVE-2026-24708, upgrade the affected package to a fixed version below.
- —upgrade to 2:22.4.0-1~deb11u7 or later
- —upgrade to 2:22.4.0-1~deb11u7 or later
- —upgrade to 2:26.2.2-1~deb12u4 or later
- —no fix listed
Is CVE-2026-24708 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (4)
- from 0, < 2:22.4.0-1~deb11u7
- from 0, < 2:22.4.0-1~deb11u7
- from 0, < 2:26.2.2-1~deb12u4
- >= 32.0.0.0rc1, <= 32.1.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.2 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H |