CVE-2026-46448 OpenStack Nova: Nova scheduler hint injection bypasses Placement resource claims and scheduling constraints
Attackers can create instances without proper resource allocation tracking, potentially bypassing quota enforcement in OpenStack Nova.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46448?
CVE-2026-46448 is a medium-severity vulnerability in OpenStack Nova, published on 16 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
In OpenStack Nova before 33.0.2, the server create API does not strip certain hint data. The resulting instance has no Placement allocation.
Weakness: CWE-669
Which versions are affected by CVE-2026-46448?
7 open source packages ship an affected version, including nova. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
nova PyPI | From 18.0.0 | 31.3.1, 32.2.1, 33.0.2 |
nova PyPI | From 18.0.0 to 31.3.0 | None |
nova PyPI | From 18.0.0 to 31.3.0 | None |
nova PyPI | From 32.0.0 | 32.2.1 |
nova PyPI | From 32.0.0 | 32.2.1 |
nova PyPI | From 33.0.0 | 33.0.2 |
1 more packages
nova PyPI | From 33.0.0 | 33.0.2 |
Products include Openstack Nova.
How do I fix CVE-2026-46448?
Upgrade nova to a fixed version for your release line: 31.3.1, 32.2.1 or 33.0.2.
Is CVE-2026-46448 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-46448 exists.
Other vulnerabilities in OpenStack Nova
- CVE-2017-7214 OpenStack Nova logs sensitive context from notification exceptions
- CVE-2017-17051 OpenStack Nova DoS by rebuilding the same instance with a new image multiple times
- CVE-2020-17376 OpenStack Nova Live migration fails to update persistent domain XML
- CVE-2017-18191 OpenStack Nova Denial of service attack on the compute host
- CVE-2015-3280 OpenStack Compute (nova) allows remote authenticated users to cause a denial of service
Sources
Also known as DEBIAN-CVE-2026-46448, GHSA-mfg3-p6m3-gjgr, PYSEC-2026-2686, UBUNTU-CVE-2026-46448, USN-8434-1.