CVE-2026-24708

HIGH8.2EPSS 0.02%

OpenStack Nova calls qemu-img without format restrictions for resize

Published: 2/18/2026Modified: 4/28/2026

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.

Affected packages (4)

CVSS scores

SourceVersionSeverityVector
osvCVSS 3.1HIGH8.2CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H

References (7)