CVE-2026-46448
OpenStack Nova: Nova scheduler hint injection bypasses Placement resource claims and scheduling constraints
Summary
## 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)
Affected packages
| Ecosystem | Package | Affected versions | Fixed versions |
|---|---|---|---|
| PyPI | nova | — | 32.2.1, 33.0.2 |
Remediation: Upgrade to 32.2.1 or later.
References
Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.
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EPSS scores provided by the FIRST.org Exploit Prediction Scoring System.