Vulnerability · Published Oct 8, 2026 · Assigned by mitre
CVE-2026-93858
High 8.7
In plain English
A high-severity OS command injection in Mistral from OpenStack. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | mistral | no fix listed | DEBIAN-CVE-2026-93858 |
| Debian:13 | mistral | no fix listed | DEBIAN-CVE-2026-93858 |
| Debian:14 | mistral | 23.0.0-2 | DEBIAN-CVE-2026-93858 |
| Ubuntu:22.04:LTS | mistral | no fix listed | UBUNTU-CVE-2026-93858 |
| Ubuntu:24.04:LTS | mistral | no fix listed | UBUNTU-CVE-2026-93858 |
| Ubuntu:26.04:LTS | mistral | no fix listed | UBUNTU-CVE-2026-93858 |
| Ubuntu:26.10 | mistral | no fix listed | UBUNTU-CVE-2026-93858 |
Affected products (as reported)
Weakness: CWE-78 · 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