CVE-2026-24708
8.2CVSSHIGH
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.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:LPrivileges RequiredLow
UI:NUser InteractionNone
Scope
S:CScopeChanged
Impact
C:NConfidentialityNone
I:HIntegrityHigh
A:HAvailabilityHigh
Weaknesses
Affected Products
Exploitability
No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
References
https://bugs.launchpad.net/nova/+bug/2137507
bugs.launchpad.net
https://www.openwall.com/lists/oss-security/2026/02/17/7
openwall.com
https://nvd.nist.gov/vuln/detail/CVE-2026-24708
nvd.nist.gov
and 3 more references View all →
Timeline
Published
Feb 18, 2026
Last Updated
Feb 21, 2026
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