CVE-2026-46448: In OpenStack Nova before 33.0.2, the server create API does not strip certain hint data

Routine

MEDIUM 5.4UPGRADE

CVE-2026-46448 is a medium-severity flaw (CVSS 5.4) affecting nova. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In OpenStack Nova before 33.0.2, the server create API does not strip certain hint data. The resulting instance has no Placement allocation.

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-669
Published	2026-06-16
Last modified	2026-10-25

Publisher (CNA): MITRE · Vendor: openstack

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-16 20:16 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

openstack nova UPGRADE

Affected: >= 18.0.0 and < 31.3.1 · >= 32.0.0 and < 32.2.1 · >= 33.0.0 and < 33.0.2

Fixed in: 31.3.1, 32.2.1, 33.0.2

Safe to downgrade to: a release before 18.0.0

1. Check installed version

apt-cache policy nova || rpm -q nova || nova --version

2. UPGRADE to 31.3.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nova

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nova

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 18.0.0 (Debian / Ubuntu)

apt-cache madison nova sudo apt install nova=<VERSION_BEFORE_18.0.0> sudo apt-mark hold nova

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list nova sudo dnf downgrade nova-<VERSION_BEFORE_18.0.0> sudo dnf versionlock add nova

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-46448?

nova: upgrade to 31.3.1, 32.2.1, 33.0.2. Exact commands for each OS are on this page.

Is CVE-2026-46448 being exploited?

CVE-2026-46448 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-46448 affect?

CVE-2026-46448 affects nova. Severity is medium (CVSS 5.4). In OpenStack Nova before 33.0.2, the server create API does not strip certain hint data. The resulting instance has no Placement allocation.

How urgent is CVE-2026-46448?

Priority 29/100. Public exploit reference

Software pages

OpenStack vulnerabilities

References

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