UBUNTU-CVE-2026-93858 (CVE-2026-93858)
Vulnerability from osv_ubuntu – Published: 2026-10-08 18:18 – Updated: 2026-10-17 09:58 – Source website
VLAI
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.
Severity
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "mistral-api",
"binary_version": "2.0.0-1ubuntu2+esm1"
},
{
"binary_name": "mistral-common",
"binary_version": "2.0.0-1ubuntu2+esm1"
},
{
"binary_name": "mistral-engine",
"binary_version": "2.0.0-1ubuntu2+esm1"
},
{
"binary_name": "mistral-executor",
"binary_version": "2.0.0-1ubuntu2+esm1"
},
{
"binary_name": "python-mistral",
"binary_version": "2.0.0-1ubuntu2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "mistral",
"purl": "pkg:deb/ubuntu/mistral@2.0.0-1ubuntu2+esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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_name": "mistral-api",
"binary_version": "6.0.0-0ubuntu1.1+esm1"
},
{
"binary_name": "mistral-common",
"binary_version": "6.0.0-0ubuntu1.1+esm1"
},
{
"binary_name": "mistral-engine",
"binary_version": "6.0.0-0ubuntu1.1+esm1"
},
{
"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_name": "python-mistral",
"binary_version": "6.0.0-0ubuntu1.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "mistral",
"purl": "pkg:deb/ubuntu/mistral@6.0.0-0ubuntu1.1+esm1?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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_name": "mistral-api",
"binary_version": "10.0.0-0ubuntu0.20.04.1"
},
{
"binary_name": "mistral-common",
"binary_version": "10.0.0-0ubuntu0.20.04.1"
},
{
"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_name": "mistral-executor",
"binary_version": "10.0.0-0ubuntu0.20.04.1"
},
{
"binary_name": "python3-mistral",
"binary_version": "10.0.0-0ubuntu0.20.04.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "mistral",
"purl": "pkg:deb/ubuntu/mistral@10.0.0-0ubuntu0.20.04.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "14.0.0-0ubuntu1.1"
},
{
"binary_name": "mistral-common",
"binary_version": "14.0.0-0ubuntu1.1"
},
{
"binary_name": "mistral-engine",
"binary_version": "14.0.0-0ubuntu1.1"
},
{
"binary_name": "mistral-event-engine",
"binary_version": "14.0.0-0ubuntu1.1"
},
{
"binary_name": "mistral-executor",
"binary_version": "14.0.0-0ubuntu1.1"
},
{
"binary_name": "python3-mistral",
"binary_version": "14.0.0-0ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "mistral",
"purl": "pkg:deb/ubuntu/mistral@14.0.0-0ubuntu1.1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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_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_name": "mistral-event-engine",
"binary_version": "18.0.1-0ubuntu1.1"
},
{
"binary_name": "mistral-executor",
"binary_version": "18.0.1-0ubuntu1.1"
},
{
"binary_name": "python3-mistral",
"binary_version": "18.0.1-0ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "mistral",
"purl": "pkg:deb/ubuntu/mistral@18.0.1-0ubuntu1.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"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": "23.0.0-0ubuntu1"
},
{
"binary_name": "mistral-common",
"binary_version": "23.0.0-0ubuntu1"
},
{
"binary_name": "mistral-engine",
"binary_version": "23.0.0-0ubuntu1"
},
{
"binary_name": "mistral-event-engine",
"binary_version": "23.0.0-0ubuntu1"
},
{
"binary_name": "mistral-executor",
"binary_version": "23.0.0-0ubuntu1"
},
{
"binary_name": "python3-mistral",
"binary_version": "23.0.0-0ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.10",
"name": "mistral",
"purl": "pkg:deb/ubuntu/mistral@23.0.0-0ubuntu1?arch=source\u0026distro=stonking"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"22.0.0-0ubuntu1",
"22.0.0-0ubuntu2",
"22.0.0+git20260814.61.b4aeb55-0ubuntu1",
"23.0.0~rc1-0ubuntu1",
"23.0.0-0ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "mistral-api",
"binary_version": "22.0.0-0ubuntu1.1"
},
{
"binary_name": "mistral-common",
"binary_version": "22.0.0-0ubuntu1.1"
},
{
"binary_name": "mistral-engine",
"binary_version": "22.0.0-0ubuntu1.1"
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "mistral",
"purl": "pkg:deb/ubuntu/mistral@22.0.0-0ubuntu1.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"21.0.0-0ubuntu1",
"21.0.0+git20260106.10.420677c8-0ubuntu1",
"22.0.0-0ubuntu1",
"22.0.0-0ubuntu1.1"
]
}
],
"aliases": [],
"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\u0027s 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.",
"id": "UBUNTU-CVE-2026-93858",
"modified": "2026-10-17T09:58:11Z",
"published": "2026-10-08T18:18:00Z",
"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"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"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": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-93858"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
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