{"id":"PYSEC-2026-692","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.","aliases":["CVE-2017-17051","GHSA-vq76-rxx3-4r4r"],"modified":"2026-07-06T08:00:47.619952818Z","published":"2026-07-02T14:13:24.579916Z","references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2017-17051"},{"type":"WEB","url":"https://github.com/openstack/nova/commit/25a1d78e83065c5bea5d8e0a017fd9d0914d41d9"},{"type":"WEB","url":"https://github.com/openstack/nova/commit/fed660c1189fdf4159d97badfdc8c5b35ad14f23"},{"type":"PACKAGE","url":"https://github.com/openstack/nova"},{"type":"WEB","url":"https://launchpad.net/bugs/1732976"},{"type":"WEB","url":"https://review.openstack.org/521662"},{"type":"WEB","url":"https://review.openstack.org/523214"},{"type":"WEB","url":"https://security.openstack.org/ossa/OSSA-2017-006.html"},{"type":"WEB","url":"http://www.securityfocus.com/bid/102102"},{"type":"PACKAGE","url":"https://pypi.org/project/nova"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-vq76-rxx3-4r4r"}],"affected":[{"package":{"name":"nova","ecosystem":"PyPI","purl":"pkg:pypi/nova"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"16.0.4"}]}],"versions":["15.1.5"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/nova/PYSEC-2026-692.yaml"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"}]}