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GHSA-mfg3-p6m3-gjgr

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

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-46448

Packages

EcosystemPackageAffectedFixed in
PyPI nova >= 18.0.0, <= 31.3.0 no fix listed
PyPI nova >= 32.0.0, < 32.2.1 32.2.1
PyPI nova >= 33.0.0, < 33.0.2 33.0.2

Details

As written in the advisory (Markdown source, shown as plain text).

## 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)

References

External links from the advisory. They lead to third-party sites.