High
mistral — security advisory
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.
- Products
- mistral
- Affected versions
- 1.0.0-1, 1.0.0-4, 10.0.0-0ubuntu0.20.04.1, 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, 13.0.0+git2021120910.b2d6de56-0ubuntu1, 13.0.0+git2022030313.55bb2564-0ubuntu1, 13.0.0-0ubuntu1, 14.0.0-0ubuntu1, 14.0.0-0ubuntu1.1, 17.0.0-0ubuntu1, 18.0.0~rc1-0ubuntu1, 18.0.1-0ubuntu1, 18.0.1-0ubuntu1.1, 2.0.0-1, 2.0.0-1ubuntu2, 2.0.0-1ubuntu2+esm1, 2.0.0~b3-3, 2.0.0~rc1-1, 2.0.0~rc2-1, 21.0.0+git20260106.10.420677c8-0ubuntu1, 21.0.0-0ubuntu1, 22.0.0+git20260814.61.b4aeb55-0ubuntu1, 22.0.0-0ubuntu1, 22.0.0-0ubuntu1.1, 22.0.0-0ubuntu2, 23.0.0-0ubuntu1, 23.0.0~rc1-0ubuntu1, 5.0.0-0ubuntu1, 6.0.0-0ubuntu1, 6.0.0-0ubuntu1.1, 6.0.0-0ubuntu1.1+esm1, 6.0.0~b1-0ubuntu1, 6.0.0~b1-0ubuntu2, 6.0.0~b2-0ubuntu1, 6.0.0~rc1-0ubuntu1, 9.0.0-0ubuntu1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-93858
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:33 UTC · Revision 1
Source evidence
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.
osv:UBUNTU-CVE-2026-93858
mistral
Fixed versions: Not specified
mistral
Fixed versions: Not specified
mistral
Fixed versions: Not specified
mistral
Fixed versions: Not specified
mistral
Fixed versions: Not specified
mistral
Fixed versions: Not specified
mistral
Fixed versions: Not specified
Complete source record
{
"id": "717b76e35ffefff2c90eee882d7487b40447ddf48bbd341693afb34a9b8b4195",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-93858",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-93858",
"summary": "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.",
"evidence": "osv:UBUNTU-CVE-2026-93858",
"products": [
{
"name": {
"value": "mistral",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
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{
"value": "1.0.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.0.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "2.0.0~b3-3",
"evidence": "/affected/0/versions"
},
{
"value": "2.0.0~rc1-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.0.0~rc2-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.0.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "2.0.0-1ubuntu2",
"evidence": "/affected/0/versions"
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{
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{
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{
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"evidence": "/affected/1/versions"
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{
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{
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"evidence": "/affected/1/versions"
},
{
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{
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{
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{
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"evidence": "/affected/3/versions"
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{
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"evidence": "/affected/3/versions"
},
{
"value": "13.0.0+git2022030313.55bb2564-0ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "14.0.0-0ubuntu1",
"evidence": "/affected/3/versions"
},
{
"value": "14.0.0-0ubuntu1.1",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
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},
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"affected_versions": [
{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
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{
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"evidence": "/affected/4/versions"
},
{
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}
]
},
{
"name": {
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"evidence": "/affected/5/package/name"
},
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"affected_versions": [
{
"value": "22.0.0-0ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "22.0.0-0ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "22.0.0+git20260814.61.b4aeb55-0ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "23.0.0~rc1-0ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "23.0.0-0ubuntu1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "mistral",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "21.0.0-0ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "21.0.0+git20260106.10.420677c8-0ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "22.0.0-0ubuntu1",
"evidence": "/affected/6/versions"
},
{
"value": "22.0.0-0ubuntu1.1",
"evidence": "/affected/6/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-93858",
"aliases": [
"UBUNTU-CVE-2026-93858"
],
"metrics": [
{
"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"
}
],
"affected": [
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],
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"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"
],
"database_specific": {
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{
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},
{
"binary_name": "mistral-executor",
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{
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},
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"6.0.0~b1-0ubuntu2",
"6.0.0~b2-0ubuntu1",
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"6.0.0-0ubuntu1",
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},
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},
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},
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},
{
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]
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}
],
"modified": "2026-10-17T13:01:18.689286680Z",
"provider": "osv",
"upstream": [
"CVE-2026-93858"
],
"references": [
"https://ubuntu.com/security/CVE-2026-93858",
"https://www.cve.org/CVERecord?id=CVE-2026-93858",
"https://launchpad.net/bugs/2162100",
"https://security.openstack.org/ossa/OSSA-2026-044.html"
]
},
"related_cves": [
{
"value": "CVE-2026-93858",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361612,
"published_at": "2026-10-08T18:18:00+00:00"
}