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Fencer Vulns
medium 5.4

CVE-2026-46448 json

OpenStack Nova: Nova scheduler hint injection bypasses Placement resource claims and scheduling constraints

published 2026-06-16 4 mo ago modified 2026-10-25 14 d ago also GHSA-mfg3-p6m3-gjgr , PYSEC-2026-2686 , EUVD-2026-37218

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 19%
public exploits
0
none known

Summary

In OpenStack Nova before 33.0.2, the server create API does not strip certain hint data. The resulting instance has no Placement allocation.

Patch / fix

  • pypi nova 31.3.1, 32.2.1, 33.0.2
  • OpenStack Nova 31.3.1, 32.2.1, 33.0.2
  • nova Debian 14 2:33.0.1-4

debian advisories DEBIAN-CVE-2026-46448

  • nova Ubuntu 22.04 LTS 3:25.2.1-0ubuntu2.11
  • nova Ubuntu 24.04 LTS 3:29.2.0-0ubuntu1.7
  • nova Ubuntu 25.10 3:32.0.0-0ubuntu1.3
  • nova Ubuntu 26.04 LTS 3:33.0.0-0ubuntu3.1

ubuntu advisories UBUNTU-CVE-2026-46448

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-46448 updated cvss 8.5

openstack-nova: OpenStack Nova: Resource allocation issue due to unstripped hint data in server creation API

  • Red Hat OpenStack Platform 16.2 python3-nova, openstack-nova, openstack-nova-api, openstack-nova-common, openstack-nova-compute, openstack-nova-console, +6 more Red Hat OpenStack Platform 17.1 python3-nova, openstack-nova, openstack-nova-api, openstack-nova-common, openstack-nova-compute, openstack-nova-conductor, +5 more Red Hat OpenStack Platform 18.0 openstack-nova
    affected: workaround, no fix available
  • Red Hat OpenStack Platform 13.0 - ELS python-nova 17.0.13-43.el7ost, openstack-nova 17.0.13-43.el7ost, python-nova-tests 17.0.13-43.el7ost, openstack-nova-api 17.0.13-43.el7ost, openstack-nova-cells 17.0.13-43.el7ost, openstack-nova-common 17.0.13-43.el7ost, +10 more
    fixed: vendor fix RHSA-2026:94039
  • Red Hat OpenStack Platform 13.0 - ELS python-webob 1.7.2-2.el7ost, openstack-heat 10.0.3-21.el7ost, python-keystone 13.0.4-10.el7ost, openstack-heat-api 10.0.3-21.el7ost, openstack-keystone 13.0.4-10.el7ost, openstack-heat-common 10.0.3-21.el7ost, +4 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
4 mo ago

Exploit prediction

0.27% chance of exploitation in the next 30 days, higher than 19% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • bugs.launchpad.net https://bugs.launchpad.net/nova/+bug/2151252 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
NVD 3.1 8.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H
GitHub 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
OSV 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

Affected packages

ecosystem package affected fixed in
pypi nova
>=18.0.0, <=31.3.0
>=32.0.0, <32.2.1
>=33.0.0, <33.0.2
>=18.0.0, <31.3.1
32.2.1
33.0.2
31.3.1

Affected products

  • OpenStack Nova

Classification

Weakness
  • CWE-669 Incorrect Resource Transfer Between Spheres

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.