PYSEC-2026-692

    Dashboard / Vulnerabilities / PYSEC-2026-692

    PYSEC-2026-692

    Published: 2 Jul 2026Last Modified: 6 Jul 2026

    Summary: OpenStack Nova DoS by rebuilding the same instance with a new image multiple times

    Details: An issue was discovered in the default FilterScheduler in OpenStack Nova 16.0.3. By repeatedly rebuilding an instance with new images, an authenticated user may consume untracked resources on a hypervisor host leading to a denial of service, aka doubled resource allocations. This regression was introduced with the fix for OSSA-2017-005 (CVE-2017-16239); however, only Nova stable/pike or later deployments with that fix applied and relying on the default FilterScheduler are affected.

    References: https://nvd.nist.gov/vuln/detail/CVE-2017-17051, https://github.com/openstack/nova/commit/25a1d78e83065c5bea5d8e0a017fd9d0914d41d9, https://github.com/openstack/nova/commit/fed660c1189fdf4159d97badfdc8c5b35ad14f23, https://github.com/openstack/nova, https://launchpad.net/bugs/1732976, https://review.openstack.org/521662, https://review.openstack.org/523214, https://security.openstack.org/ossa/OSSA-2017-006.html, http://www.securityfocus.com/bid/102102, https://pypi.org/project/nova, https://github.com/advisories/GHSA-vq76-rxx3-4r4r

    Affected packages

    Package

    Name: nova

    Purl: pkg:pypi/nova

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -16.0.4

    Affected versions

    15.1.5

    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
    PYSEC-2026-692 | CVE-DB