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.

The remote Redhat Enterprise Linux 9 host has packages installed that are affected by a vulnerability as referenced in the RHSA-2026:7884 advisory.

    OpenStack Compute (nova) is open source software designed     to provision and manage large networks of virtual machines, creating a     redundant and scalable cloud computing platform. It gives you the software,     control panels, and APIs required to orchestrate a cloud, including running     instances, managing networks, and controlling access through users and     projects. OpenStack Compute strives to be both hardware and hypervisor     agnostic, currently supporting a variety of standard hardware     configurations and seven major hypervisors.

    Security Fix(es):

    * Arbitrary Host File Overwrite via Unconstrained qemu-img Format Handling in OpenStack Nova     (CVE-2026-24708)

    For more details about the security issue(s), including the impact, a CVSS     score, acknowledgments, and other related information, refer to the CVE     page listed in the References section.

Tenable has extracted the preceding description block directly from the Red Hat Enterprise Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 11 host has packages installed that are affected by a vulnerability as referenced in the dla-4486 advisory.

    -------------------------------------------------------------------------     Debian LTS Advisory DLA-4486-1                debian-lts@lists.debian.org     https://www.debian.org/lts/security/          Carlos Henrique Lima Melara     February 20, 2026                             https://wiki.debian.org/LTS
    -------------------------------------------------------------------------

    Package        : nova     Version        : 2:22.4.0-1~deb11u7     CVE ID         : CVE-2026-24708     Debian Bug     : 1128294

    Dan Smith discovered that nova, a cloud computing fabric controller,     calls qemu-img without format restrictions for resize, which may result     in unsafe image resize operations that could destroy data on the host     system. Only compute nodes using the Flat image backend are affected.

    For Debian 11 bullseye, this problem has been fixed in version     2:22.4.0-1~deb11u7.

    We recommend that you upgrade your nova packages.

    For the detailed security status of nova please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/nova

    Further information about Debian LTS security advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://wiki.debian.org/LTS     Attachment:
    signature.asc     Description: PGP signature

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Debian 12 / 13 host has packages installed that are affected by a vulnerability as referenced in the dsa-6145 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6145-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     February 19, 2026                     https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : nova     CVE ID         : CVE-2026-24708     Debian Bug     : 1128294

    Dan Smith discovered that nova, a cloud computing fabric controller,     calls qemu-img without format restrictions for resize, which may result     in unsafe image resize operations that could destroy data on the host     system. Only compute nodes using the Flat image backend are affected.

    For the oldstable distribution (bookworm), this problem has been fixed     in version 2:26.2.2-1~deb12u4.

    For the stable distribution (trixie), this problem has been fixed in     version 2:31.0.0-6+deb13u2.

    We recommend that you upgrade your nova packages.

    For the detailed security status of nova please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/nova

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 host has packages installed that are affected by a vulnerability as referenced in the USN-8049-1 advisory.

    Dan Smith discovered that Nova incorrectly called qemu-img without a format restriction when resizing     disks. An attacker could possibly use this issue to destroy data on the host system.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-24708)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
310913	RHEL 9 : Red Hat OpenStack Services on OpenShift 18.0.18 (openstack-nova) (RHSA-2026:7884)	Nessus	Red Hat Local Security Checks	high
299718	Debian dla-4486 : nova-api - security update	Nessus	Debian Local Security Checks	high
299631	Debian dsa-6145 : nova-api - security update	Nessus	Debian Local Security Checks	high
299492	Ubuntu 22.04 LTS / 24.04 LTS / 25.10 : Nova vulnerability (USN-8049-1)	Nessus	Ubuntu Local Security Checks	high
299348	Linux Distros Unpatched Vulnerability : CVE-2026-24708	Nessus	Misc.	high

Detections

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CVE-2026-24708

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