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Vulnerabilities

Vulnerability · CVE-2026-46448

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

Published Jun 16, 2026 · catalog updated Nov 13, 2026 · OpenStack Nova: Nova scheduler

Last checked Nov 13, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-46448. EPSS is 0.29%. Act only if a listed version of OpenStack Nova: Nova scheduler is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (OpenStack Nova: Nova scheduler).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High8.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.29%
Remediation
Version ranges on file
Affected products
PyPI nova · cpe openstack/nova

## Affects - Nova: >=18.0.0 =32.0.0 =33.0.0 <33.0.2 ## Description Erichen from the Institute of Computing Technology, Chinese Academy of Sciences reported that Nova's server create API does not strip internal scheduler hints. An authenticated user can bypass Placement resource claims and scheduling constraint enforcement, including availability zone, host aggregate, and image trait restrictions. The resulting instance has no Placement allocation, which can lead to compute node resource exhaustion and cross-tenant data persistence on NVMe devices after instance deletion. Deployments running Nova 18.0.0 or later are affected. ## Patches - https://review.opendev.org/993604 (2025.1/epoxy) - https://review.opendev.org/993603 (2025.2/flamingo) - https://review.opendev.org/993602 (2026.1/gazpacho) - https://review.opendev.org/993601 (2026.2/hibiscus) ## Credits - Erichen from Institute of Computing Technology, Chinese Academy of Sciences (CVE-2026-46448)

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • PyPI nova18.0.0 → 31.3.0
  • PyPI nova32.0.0 → 32.2.1
  • PyPI nova33.0.0 → 33.0.2
  • cpe openstack/nova< 31.3.1
  • cpe openstack/nova< 32.2.1
  • cpe openstack/nova< 33.0.2

How to fix CVE-2026-46448

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-46448. EPSS is 0.29%. Act only if a listed version of OpenStack Nova: Nova scheduler is installed.

Which versions are affected?

Compare what you have installed with 18.0.0 → 31.3.0, 32.0.0 → 32.2.1, 33.0.0 → 33.0.2, < 31.3.1, < 32.2.1, < 33.0.2. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-669: Incorrect Resource Transfer Between Spheres. EPSS 0.29%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 16, 2026 · PyPA Advisory Database

    Detected

    ## Affects - Nova: >=18.0.0 =32.0.0 =33.0.0 <33.0.2 ## Description Erichen from the Institute of Computing Technology, Chinese Academy of Sciences reported that Nova's server create API does not strip internal scheduler hints. An authenticated user can bypass Placement resource claims and scheduling constraint enforcement, including availability zone, host aggregate, and image trait restrictions.

  2. Nov 13, 2026 · PyPA Advisory Database

    Fix available

    nova fixed in 32.2.1; nova fixed in 33.0.2

  3. Nov 13, 2026 · PyPA Advisory Database

    Fix available

    nova fixed in 31.3.0

  4. Nov 13, 2026 · PyPA Advisory Database

    Fix available

    nova fixed in 32.2.1

  5. Nov 13, 2026 · PyPA Advisory Database

    Fix available

    nova fixed in 33.0.2

  6. Nov 13, 2026 · PyPA Advisory Database

    Updated

    ## Affects - Nova: >=18.0.0 =32.0.0 =33.0.0 <33.0.2 ## Description Erichen from the Institute of Computing Technology, Chinese Academy of Sciences reported that Nova's server create API does not strip internal scheduler hints. An authenticated user can bypass Placement resource claims and scheduling constraint enforcement, including availability zone, host aggregate, and image trait restrictions.

Sources

  • CVE.orgVulnerability recordCVE-2026-46448

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-46448

    30-day exploitation probability 0.29%

    first.org
  • NIST NVDVulnerability recordCVE-2026-46448

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

    nvd.nist.gov
  • PyPA Advisory DatabasePackage advisoryGHSA-mfg3-p6m3-gjgr

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

    osv.dev

References

Freshness

Last verified in this catalog Nov 13, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 13, 2026
  • NIST NVDNov 13, 2026
  • CVE.orgNov 13, 2026
  • PyPA Advisory DatabaseNov 13, 2026