PYSEC-2026-692

Vulnerability from pysec - Published: 2026-07-02 14:13 - Updated: 2026-07-06 07:36
VLAI
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.

Severity
8.6 (High)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Impacted products
Name purl
nova pkg:pypi/nova
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "nova",
        "purl": "pkg:pypi/nova"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "16.0.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "15.1.5"
      ]
    }
  ],
  "aliases": [
    "CVE-2017-17051",
    "GHSA-vq76-rxx3-4r4r"
  ],
  "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.",
  "id": "PYSEC-2026-692",
  "modified": "2026-07-06T07:36:58.239452Z",
  "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"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "OpenStack Nova DoS by rebuilding the same instance with a new image multiple times"
}


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