PYSEC-2026-860

    Dashboard / Vulnerabilities / PYSEC-2026-860

    PYSEC-2026-860

    Published: 6 Jul 2026Last Modified: 7 Jul 2026

    Summary: OpenStack Compute (Nova) Denial of service due to improper validation of virtual size of QCOW2 image

    Details: OpenStack Compute (Nova) Folsom, Grizzly, and Havana, when use_cow_images is set to False, does not verify the virtual size of a QCOW2 image, which allows local users to cause a denial of service (host file system disk consumption) by transferring an image with a large virtual size that does not contain a large amount of data from Glance. NOTE: this issue is due to an incomplete fix for CVE-2013-2096.

    References: https://nvd.nist.gov/vuln/detail/CVE-2013-4469, https://github.com/openstack/nova/commit/135faa7b5d9855312bedc19e5e1ecebae34d3d18, https://github.com/openstack/nova/commit/3cdfe894ab58f7b91bf7fb690fc5bc724e44066f, https://github.com/openstack/nova/commit/f6810be4ae1a6c93e7d8017ee67d5344dfdf4a30, https://bugs.launchpad.net/nova/+bug/1206081, https://github.com/openstack/nova, http://www.openwall.com/lists/oss-security/2013/10/31/3, http://www.ubuntu.com/usn/USN-2247-1, https://pypi.org/project/nova, https://github.com/advisories/GHSA-2w87-5qcj-j6gx

    Affected packages

    Package

    Name: nova

    Purl: pkg:pypi/nova

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -12.0.0a0

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High