CVE-2026-93858
Received Received - Intake

Remote Code Execution in OpenStack Mistral

Publication date: 2026-10-08

Last updated on: 2026-10-08

Assigner: MITRE

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.

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Meta Information

Published
2026-10-08
Last Modified
2026-10-08
Generated
2026-10-08
AI Q&A
2026-10-08
EPSS Evaluated
N/A
NVD
CVE-2026-93858
EUVD
EUVD-2026-95121

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
OpenStack Mistral 0
OpenStack Mistral 21.0.0
OpenStack Mistral 22.0.0
OpenStack Mistral 23.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

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Executive Summary

CVE-2026-93858 is a vulnerability in OpenStack Mistral through version 23.0.0. It involves the std.ssh_proxied action passing a user-supplied proxy_command directly to paramiko.ProxyCommand() without validation. An authenticated project member can submit a malicious proxy_command to execute arbitrary local commands on the executor host under the service account.

Detection Guidance

Check Mistral logs for suspicious action executions involving std.ssh_proxied with unusual proxy_command values. Review executor host processes for unexpected subprocesses spawned by the Mistral service account.

Impact Analysis

This vulnerability allows an attacker with Mistral project access to execute arbitrary code on the Mistral executor host. This could lead to unauthorized file creation or modification, potential data theft, or further compromise of the OpenStack control plane. The impact depends on the executor host's privileges and network access.

Compliance Impact

This vulnerability could lead to unauthorized access or data exfiltration, violating confidentiality requirements in GDPR and HIPAA. Organizations using affected Mistral versions may face compliance violations if exploited, potentially resulting in regulatory penalties or data breach notifications.

Mitigation Strategies

Apply available patches that enforce a default-deny policy for proxy commands. Alternatively, disable the std.ssh_proxied action in Mistral configuration until patches are applied.

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