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GHSA-m4f3-qp2w-gwh6

OpenStack Nova calls qemu-img without format restrictions for resize

Source: GitHub Advisory Database (reviewed) High CVE-2026-24708

Packages

EcosystemPackageAffectedFixed in
PyPI Nova >= 32.0.0.0rc1, <= 32.1.0 no fix listed
PyPI Nova >= 31.0.0.0rc1, <= 31.2.0 no fix listed
PyPI Nova <= 30.2.1 no fix listed

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.