HIGH8.2
PYSEC-2026-2685
OpenStack Nova calls qemu-img without format restrictions for resize
Details
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.
Are you affected?
Enter the version of the package you're using.
Affected packages
PyPI/nova
Introduced in:
0No fixed version published yet for nova (pip). Pin to a known-safe version or switch to an alternative.
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-24708[ADVISORY]
- https://github.com/openstack/nova/commit/3eba22ff09c81a61750fbb4882e5f1f01a20fdf5[WEB]
- https://bugs.launchpad.net/nova/+bug/2137507[WEB]
- https://github.com/openstack/nova[PACKAGE]
- https://lists.debian.org/debian-lts-announce/2026/02/msg00025.html[WEB]
- https://www.openwall.com/lists/oss-security/2026/02/17/7[WEB]
- https://pypi.org/project/nova[PACKAGE]
- https://github.com/advisories/GHSA-m4f3-qp2w-gwh6[ADVISORY]