CVE-2026-93858

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{"acknowledgement": "Upstream acknowledges Chen YuXiang (Institute of Computing Technology, Chinese Academy of Sciences) as the original reporter.", "bugzilla": {"description": "openstack-mistral: mistral: OS command injection via unvalidated proxy_command in std.ssh_proxied action", "id": "2544711", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2544711"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-78", "details": ["A flaw was found in OpenStack Mistral. The std.ssh_proxied built-in action accepts a user-supplied proxy_command parameter that is passed without validation to a system subprocess call on the Mistral executor host. An authenticated attacker can craft a malicious workflow that supplies an arbitrary command string as the proxy_command parameter, causing the Mistral executor to run that command as its operating system process user. Successful exploitation allows full remote code execution on the executor host with the privileges of the Mistral executor service account."], "mitigation": {"lang": "en:us", "value": "Operators can disable the std.ssh_proxied action by adding 'std.ssh_proxied' to the denylist under the [action_providers] section of mistral.conf and restarting the Mistral executor service. Alternatively, restrict workflow execution privileges so that only trusted users or service accounts can create and run workflows containing std.ssh_proxied actions."}, "name": "CVE-2026-93858", "package_state": [{"cpe": "cpe:/a:redhat:openstack:13", "fix_state": "Under investigation", "package_name": "openstack-mistral", "product_name": "Red Hat OpenStack Platform 13 (Queens)"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Affected", "package_name": "openstack-mistral", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Under investigation", "package_name": "rhosp-rhel8/openstack-mistral-api", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Under investigation", "package_name": "rhosp-rhel8/openstack-mistral-base", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Under investigation", "package_name": "rhosp-rhel8/openstack-mistral-engine", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Under investigation", "package_name": "rhosp-rhel8/openstack-mistral-event-engine", "product_name": "Red Hat OpenStack Platform 16.2"}, {"cpe": "cpe:/a:redhat:openstack:16.2", "fix_state": "Under investigation", "package_name": "rhosp-rhel8/openstack-mistral-executor", "product_name": "Red Hat OpenStack Platform 16.2"}], "public_date": "2026-10-08T19:16:20Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-93858\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-93858\nhttps://launchpad.net/bugs/2162100"], "statement": "Red Hat product impact analysis pending. Component mapping required to determine which Red Hat OpenStack Platform or Red Hat OpenStack Services on OpenShift releases ship the affected Mistral version. Deployments that do not expose the std.ssh_proxied action (via the action_providers denylist configuration option in mistral.conf) are not exploitable via this vector.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,20.1.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[21.0.0,21.0.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[22.0.0,22.0.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "23.0.0"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Mistral", "source": "cna", "vendor": "OpenStack"}, "product": "mistral", "vendor": "openstack"}], "created": "2026-10-08T19:00:07.490472+00:00", "title": "Unvalidated SSH ProxyCommand Allows Arbitrary Command Execution in OpenStack Mistral", "updated": "2026-10-08T19:15:20.091305+00:00", "vendors": ["openstack", "openstack$PRODUCT$mistral"]}