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CVE-2026-93858

In OpenStack Mistral through 23.0.0, the std.ssh_proxied action passes a caller-supplied...

8.7 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.43%Unchanged since Oct 9, 2026
90%50%10%1%

What each source reports

CVE List Score used 8.7

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.

Record
CVE-2026-93858
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N
Weakness
CWE-78
Updated
2026-11-02
EUVDEUVD-2026-95121 8.7

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.

Record
EUVD-2026-95121
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-gxqc-3r52-88h8 8.7

In OpenStack Mistral through 23.0.0, the std.ssh_proxied action passes a caller-supplied...

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.

Record
GHSA-gxqc-3r52-88h8
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-78
Updated
2026-11-02
NVD 8.7

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.

Record
CVE-2026-93858
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weakness
CWE-78
Updated
2026-11-02
OSV 8.7

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.

Record
CVE-2026-93858
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N
Weakness
CWE-78
Updated
2026-11-02
OSVDEBIAN-CVE-2026-93858 8.7

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.

Record
DEBIAN-CVE-2026-93858
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-93858 8.7

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.

Record
UBUNTU-CVE-2026-93858
CVSS 4.0
8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:L/SI:N/SA:N
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
mistral
Debian:12
All versions, plus listed versions
15.0.0-115.0.0-1+deb12u116.0.0-116.0.0-216.0.0-3
Show 32 moreShow less
16.0.0-416.0.0~rc1-117.0.0-117.0.0-217.0.0-317.0.0~rc1-118.0.0~rc1-118.0.1-119.0.0-119.0.0-219.0.0~rc1-119.0.0~rc1-220.0.0-120.0.0-220.0.0~rc1-120.0.0~rc1-221.0.0-121.0.0-221.0.0-421.0.0-521.0.0-621.0.0~rc1-121.0.0~rc1-222.0.0-122.0.0-322.0.0~rc1-122.0.0~rc1-222.0.0~rc1-323.0.0-123.0.0-223.0.0~rc1-123.0.0~rc1-2
None known
mistral
Debian:13
All versions, plus listed versions
20.0.0-220.0.0-2+deb13u121.0.0-121.0.0-221.0.0-4
Show 13 moreShow less
21.0.0-521.0.0-621.0.0~rc1-121.0.0~rc1-222.0.0-122.0.0-322.0.0~rc1-122.0.0~rc1-222.0.0~rc1-323.0.0-123.0.0-223.0.0~rc1-123.0.0~rc1-2
None known
mistral
Debian:14
before 23.0.0-2, plus listed versions
20.0.0-221.0.0-121.0.0-221.0.0-421.0.0-5
Show 11 moreShow less
21.0.0-621.0.0~rc1-121.0.0~rc1-222.0.0-122.0.0-322.0.0~rc1-122.0.0~rc1-222.0.0~rc1-323.0.0-123.0.0~rc1-123.0.0~rc1-2
23.0.0-2
mistral
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
1.0.0-11.0.0-42.0.0~b3-32.0.0~rc1-12.0.0~rc2-12.0.0-12.0.0-1ubuntu22.0.0-1ubuntu2+esm1
None known
mistral
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
5.0.0-0ubuntu16.0.0~b1-0ubuntu16.0.0~b1-0ubuntu26.0.0~b2-0ubuntu16.0.0~rc1-0ubuntu16.0.0-0ubuntu16.0.0-0ubuntu1.16.0.0-0ubuntu1.1+esm1
None known
mistral
Ubuntu:20.04:LTS
All versions, plus listed versions
9.0.0-0ubuntu110.0.0~b1~git2019121815.bc46b29f-0ubuntu110.0.0~b2~git2020020609.5b5576dd-0ubuntu110.0.0~b3~git2020032611.8a5d35ac-0ubuntu110.0.0~b3~git2020041013.a7da00d7-0ubuntu110.0.0-0ubuntu0.20.04.1
None known
mistral
Ubuntu:22.04:LTS
All versions, plus listed versions
13.0.0-0ubuntu113.0.0+git2021120910.b2d6de56-0ubuntu113.0.0+git2022030313.55bb2564-0ubuntu114.0.0-0ubuntu114.0.0-0ubuntu1.1
None known
mistral
Ubuntu:24.04:LTS
All versions, plus listed versions
17.0.0-0ubuntu118.0.0~rc1-0ubuntu118.0.1-0ubuntu118.0.1-0ubuntu1.1
None known
mistral
Ubuntu:26.10
All versions, plus listed versions
22.0.0-0ubuntu122.0.0-0ubuntu222.0.0+git20260814.61.b4aeb55-0ubuntu123.0.0~rc1-0ubuntu123.0.0-0ubuntu1
None known
mistral
Ubuntu:26.04:LTS
All versions, plus listed versions
21.0.0-0ubuntu121.0.0+git20260106.10.420677c8-0ubuntu122.0.0-0ubuntu122.0.0-0ubuntu1.1
None known

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-93858 is a high vulnerability (CVSS 8.7) in Openstack Mistral, published October 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.43%, the 37th percentile. Fixed in mistral 23.0.0-2.

References

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