Summary
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.
Credits
- Erichen from Institute of Computing Technology, Chinese Academy of
Sciences (CVE-2026-46448)
Impact
CVE-2026-46448 has a CVSS score of 5.4 (Medium). The vector is network-reachable, low privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (32.2.1); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
Remediation advice
- 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)
Frequently Asked Questions
- What is CVE-2026-46448? CVE-2026-46448 is a medium-severity security vulnerability in nova (pip), affecting versions >= 18.0.0, <= 31.3.0. It is fixed in 32.2.1.
- How severe is CVE-2026-46448? CVE-2026-46448 has a CVSS score of 5.4 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of nova are affected by CVE-2026-46448? nova (pip) versions >= 18.0.0, <= 31.3.0 is affected.
- Is there a fix for CVE-2026-46448? Yes. CVE-2026-46448 is fixed in 32.2.1. Upgrade to this version or later.
- Is CVE-2026-46448 exploitable, and should I be worried? Whether CVE-2026-46448 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2026-46448 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2026-46448? Upgrade
novato 32.2.1 or later.