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CVE-2026-93858

HIGH 8.7

Published 2026-10-08 · Last modified 2026-10-08

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.

ELEVATED IMPACT

Severe if exploited (CVSS 8.7), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.4%chance of exploitation in 30 days · 37th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

8.7CVSS 4.0 · HIGH

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ⚠Privileges: Requires a low-privilege account
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable
  • ✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Openstack

Products Mistral

Weakness (CWE)

  • CWE-78: OS Command Injection

CVSS vector

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

References and research data (JSON)

Vendor product assessments

  • openstack-mistral-all as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-all

    • workaround: 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.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-api as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-api

    • workaround: 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.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-common as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-common

    • workaround: 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.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-engine as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-engine

    • workaround: 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.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-event-engine as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-event-engine

    • workaround: 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.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-executor as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-executor

    • workaround: 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.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral.src as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral?arch=src

    • workaround: 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.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • python-mistral as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python-mistral

    • workaround: 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.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • python-mistral-tests as a component of Red Hat OpenStack Platform 13 (Queens) · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python-mistral-tests

    • workaround: 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.
    • no fix planned: Out of support scope
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-all as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-all

    • workaround: 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.
    • none available: Affected
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-api as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-api

    • workaround: 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.
    • none available: Affected
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-common as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-common

    • workaround: 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.
    • none available: Affected
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-engine as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-engine

    • workaround: 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.
    • none available: Affected
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-event-engine as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-event-engine

    • workaround: 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.
    • none available: Affected
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-executor as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-executor

    • workaround: 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.
    • none available: Affected
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • openstack-mistral-notifier as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/openstack-mistral-notifier

    • workaround: 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.
    • none available: Affected
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • python3-mistral as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python3-mistral

    • workaround: 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.
    • none available: Affected
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00
  • rhosp-rhel8/openstack-mistral-event-engine as a component of Red Hat OpenStack Platform 16.2 · known affected

    Vendor assessment for this product only.

    pkg:oci/openstack-mistral-event-engine?repository_url=registry.redhat.io/rhosp-rhel8/openstack-mistral-event-engine

    • workaround: 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.
    • none available: Affected
    Red Hat · CVE-2026-93858 · Updated 2026-10-09T16:24:23+00:00

All CVSS metrics

  • HIGH 8.7 v4.0 · CNA Primary
    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
  • HIGH 8.7 v4.0 · NVD Secondary
    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/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

References

Exploit-tagged references (not proof of a PoC)

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS