# CVE-2026-93858: Command injection in Mistral

> An authenticated user can execute arbitrary commands on the executor host via the std.ssh_proxied action in OpenStack Mistral.

- **Severity:** High 8.7 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Oct 2026
- **Updated:** 8 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-93858, GHSA-gxqc-3r52-88h8, UBUNTU-CVE-2026-93858

## What is CVE-2026-93858?

CVE-2026-93858 is a high-severity command injection vulnerability in OpenStack Mistral, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official 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.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command)

## Which versions are affected by CVE-2026-93858?


## How do I fix CVE-2026-93858?

Apply the vendor's patch.

## Is CVE-2026-93858 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-93858 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-93858 and fix it if it is affected.

What it is: CVE-2026-93858 is a high-severity command injection vulnerability in OpenStack Mistral, published on 8 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-93858 exists.

Affected product: OpenStack Mistral. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-93858/ (Markdown: https://insights.sbomify.com/CVE-2026-93858/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-93858
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-93858
- OSV: https://osv.dev/vulnerability/CVE-2026-93858

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-93858/
Summaries are generated and may contain mistakes; the official description above is the record.