Vulnerability in OpenStack Nova
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. 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.
EPSS: 0.003 (27.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:H/A:H.
Affected products
- Openstack Nova — versions 0, 31.0.0, 32.0.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-24708?
- CVE-2026-24708 is a high-severity vulnerability in OpenStack Nova, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 8.2/10. Published 2026-02-18.
- How severe is CVE-2026-24708?
- High severity. CVSS v3 base score is 8.2 out of 10.