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MEDIUM5.4

PYSEC-2026-2686

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

Quick fix

PYSEC-2026-2686 — nova: upgrade to the fixed version with the command below.

pip install --upgrade 'nova>=31.3.1'

Details

## 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)

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/nova
Introduced in: 18.0.0Fixed in: 31.3.1
Fixpip install --upgrade 'nova>=31.3.1'

References