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🛡️ CVE-2026-46448 — nova

🟡 CVSS 5.4 — Medium ⚠️ Exploit Public CWE-669 OSV
5.4
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

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

Affects

  • Nova: >=18.0.0 <31.3.1, >=32.0.0 <32.2.1, >=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)

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability low.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: None.
  • Availability impact: Low — limited, and the attacker does not choose what is affected.

Weakness class

CVE-2026-46448 is classified as CWE-669: Incorrect Resource Transfer Between Spheres. The product does not properly transfer a resource/behavior to another sphere, or improperly imports a resource/behavior from another sphere, in a manner that provides unintended control over that resource.

Affected software

CVE-2026-46448 is recorded against 1 package.

  • nova (from 33.0.0 up to 33.0.2)

Timeline and source

Published on 13 July 2026 and last revised on 21 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
bugs.launchpad.net (Web)
github.com (Package)
review.opendev.org (Web)
review.opendev.org (Web)
review.opendev.org (Web)
review.opendev.org (Web)
www.openwall.com (Web)
www.openwall.com (Web)
pypi.org (Package)
github.com (Advisory)

Other advisories for this package

nova has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-669: Incorrect Resource Transfer Between Spheres) in other software:

Details

Severity MEDIUM
CVSS Score 5.4
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L
CWE CWE-669
Public Exploit ⚠️ Yes
Source OSV
Published 2026-07-13
Updated 2026-08-20
Modified 2026-07-21
Fix URL N/A

Affected Packages

Software From version Fixed in
nova 33.0.0 33.0.2

Similar Threats

Exploit Protection

Are you running nova?

CVE-2026-46448 carries CVSS 5.4 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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