CVE-2026-54100

[CVE catalog]

A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform. WMCO establishes SSH connections to Windows worker nodes without verifying the remote server host key. An adjacent-network attacker who can intercept or redirect WMCO's SSH session can capture WICD and kubelet bootstrap credentials transferred during node configuration, enabling compromise of Windows node identities in the cluster. windows-machine-config-operator: windows-machine-config-operator: SSH host key not verified enables credential theft This flaw affects Windows Machine Config Operator (WMCO) with one or more Windows worker nodes. Clusters without Windows nodes or without WMCO installed are not affected. Red Hat Security Ratings classify this as High severity because successful exploitation yields highly sensitive node bootstrap and WICD credentials, but requires adjacent network positioning and favorable timing rather than direct remote exploitation of the Kubernetes API. The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Severity

High · CVSS 8.3CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Published

Jun 10, 2026, 12:00:00 AM UTC

Source

[NVD] · [CVE record]

EPSS

0.30% · Oct 27, 2026

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  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "openshift_container_platform",
      "ecosystem": "cpe",
      "fixed_version": ""
    },
    {
      "name": "windows_machine_config_operator",
      "ecosystem": "cpe",
      "fixed_version": ""
    },
    {
      "name": "openshift_container_platform",
      "ranges": [
        {
          "fixed": "",
          "introduced": "4.0",
          "last_affected": "4.22.1",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-54100"
    },
    {
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      "ranges": [],
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    }
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}