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EUVD-2026-327969

fkie_cve-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.

GHSA-mfg3-p6m3-gjgr — OpenStack Nova: Nova scheduler hint injection bypasses Placement resource claims and scheduling constraints

Affected: PyPI: nova

## 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)

PYSEC-2026-2686 — OpenStack Nova: Nova scheduler hint injection bypasses Placement resource claims and scheduling constraints