{"id":"UBUNTU-CVE-2026-93858","details":"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.","modified":"2026-10-14T03:23:48.367168603Z","published":"2026-10-13T00:00:00Z","upstream":["CVE-2026-93858"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-93858"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-93858"},{"type":"REPORT","url":"https://launchpad.net/bugs/2162100"},{"type":"REPORT","url":"https://security.openstack.org/ossa/OSSA-2026-044.html"}],"affected":[{"package":{"name":"mistral","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/mistral?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.0.0-1","1.0.0-4","2.0.0~b3-3","2.0.0~rc1-1","2.0.0~rc2-1","2.0.0-1","2.0.0-1ubuntu2","2.0.0-1ubuntu2+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.0-1ubuntu2+esm1","binary_name":"mistral-api"},{"binary_name":"mistral-common","binary_version":"2.0.0-1ubuntu2+esm1"},{"binary_name":"mistral-engine","binary_version":"2.0.0-1ubuntu2+esm1"},{"binary_version":"2.0.0-1ubuntu2+esm1","binary_name":"mistral-executor"},{"binary_version":"2.0.0-1ubuntu2+esm1","binary_name":"python-mistral"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93858.json"}},{"package":{"name":"mistral","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/mistral?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.0-0ubuntu1","6.0.0~b1-0ubuntu1","6.0.0~b1-0ubuntu2","6.0.0~b2-0ubuntu1","6.0.0~rc1-0ubuntu1","6.0.0-0ubuntu1","6.0.0-0ubuntu1.1","6.0.0-0ubuntu1.1+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"6.0.0-0ubuntu1.1+esm1","binary_name":"mistral-api"},{"binary_name":"mistral-common","binary_version":"6.0.0-0ubuntu1.1+esm1"},{"binary_version":"6.0.0-0ubuntu1.1+esm1","binary_name":"mistral-engine"},{"binary_name":"mistral-event-engine","binary_version":"6.0.0-0ubuntu1.1+esm1"},{"binary_name":"mistral-executor","binary_version":"6.0.0-0ubuntu1.1+esm1"},{"binary_version":"6.0.0-0ubuntu1.1+esm1","binary_name":"python-mistral"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93858.json"}},{"package":{"name":"mistral","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/mistral?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["9.0.0-0ubuntu1","10.0.0~b1~git2019121815.bc46b29f-0ubuntu1","10.0.0~b2~git2020020609.5b5576dd-0ubuntu1","10.0.0~b3~git2020032611.8a5d35ac-0ubuntu1","10.0.0~b3~git2020041013.a7da00d7-0ubuntu1","10.0.0-0ubuntu0.20.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"mistral-api","binary_version":"10.0.0-0ubuntu0.20.04.1"},{"binary_version":"10.0.0-0ubuntu0.20.04.1","binary_name":"mistral-common"},{"binary_name":"mistral-engine","binary_version":"10.0.0-0ubuntu0.20.04.1"},{"binary_name":"mistral-event-engine","binary_version":"10.0.0-0ubuntu0.20.04.1"},{"binary_version":"10.0.0-0ubuntu0.20.04.1","binary_name":"mistral-executor"},{"binary_version":"10.0.0-0ubuntu0.20.04.1","binary_name":"python3-mistral"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93858.json"}},{"package":{"name":"mistral","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/mistral?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["13.0.0-0ubuntu1","13.0.0+git2021120910.b2d6de56-0ubuntu1","13.0.0+git2022030313.55bb2564-0ubuntu1","14.0.0-0ubuntu1","14.0.0-0ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_version":"14.0.0-0ubuntu1.1","binary_name":"mistral-api"},{"binary_version":"14.0.0-0ubuntu1.1","binary_name":"mistral-common"},{"binary_name":"mistral-engine","binary_version":"14.0.0-0ubuntu1.1"},{"binary_name":"mistral-event-engine","binary_version":"14.0.0-0ubuntu1.1"},{"binary_version":"14.0.0-0ubuntu1.1","binary_name":"mistral-executor"},{"binary_version":"14.0.0-0ubuntu1.1","binary_name":"python3-mistral"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93858.json"}},{"package":{"name":"mistral","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/mistral?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["17.0.0-0ubuntu1","18.0.0~rc1-0ubuntu1","18.0.1-0ubuntu1","18.0.1-0ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"mistral-api","binary_version":"18.0.1-0ubuntu1.1"},{"binary_name":"mistral-common","binary_version":"18.0.1-0ubuntu1.1"},{"binary_name":"mistral-engine","binary_version":"18.0.1-0ubuntu1.1"},{"binary_version":"18.0.1-0ubuntu1.1","binary_name":"mistral-event-engine"},{"binary_name":"mistral-executor","binary_version":"18.0.1-0ubuntu1.1"},{"binary_name":"python3-mistral","binary_version":"18.0.1-0ubuntu1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93858.json"}},{"package":{"name":"mistral","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/mistral?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["21.0.0-0ubuntu1","21.0.0+git20260106.10.420677c8-0ubuntu1","22.0.0-0ubuntu1","22.0.0-0ubuntu1.1"],"ecosystem_specific":{"binaries":[{"binary_name":"mistral-api","binary_version":"22.0.0-0ubuntu1.1"},{"binary_version":"22.0.0-0ubuntu1.1","binary_name":"mistral-common"},{"binary_version":"22.0.0-0ubuntu1.1","binary_name":"mistral-engine"},{"binary_name":"mistral-event-engine","binary_version":"22.0.0-0ubuntu1.1"},{"binary_name":"mistral-executor","binary_version":"22.0.0-0ubuntu1.1"},{"binary_name":"python3-mistral","binary_version":"22.0.0-0ubuntu1.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-93858.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"},{"type":"Ubuntu","score":"medium"}]}