What is CVE-2026-46448?

CVE-2026-46448 is a medium-severity vulnerability in OpenStack Nova, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 5.4/10. Published 2026-06-16.

How severe is CVE-2026-46448?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in OpenStack Nova

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.

Published 2026-06-16 · last modified 2026-06-26.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L.

EPSS exploit prediction

EPSS: 0.005 (37.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.005 · change: +0.002

Affected products

OpenStack Nova — versions 18.0.0, 32.0.0, 33.0.0

Weakness classification (CWE)

CWE-669 — Incorrect Resource Transfer Between Spheres

References

bugs.launchpad.net/nova/+bug/2151252 (Exploit, Third Party Advisory, Issue Tracking)
www.openwall.com/lists/oss-security/2026/06/16/5 (Mailing List, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-46448?: CVE-2026-46448 is a medium-severity vulnerability in OpenStack Nova, classified under Incorrect Resource Transfer Between Spheres. CVSS score: 5.4/10. Published 2026-06-16.
How severe is CVE-2026-46448?: Medium severity. CVSS v3 base score is 5.4 out of 10.