Release notes for past releases of the Windows Machine Config Operator

You can review the release notes to learn about changes in previous versions of the Windows Machine Config Operator (WMCO).

For the current Red Hat OpenShift support for Windows Containers release notes, see "Red Hat OpenShift support for Windows Containers release notes".

Release notes for Red Hat Windows Machine Config Operator 10.22.0

Issued: 20 May 2026

You can review the following release notes to learn about the new features and bug fixes in the Windows Machine Config Operator (WMCO) version 10.22.0.

The components of the WMCO version 10.22.0 were released in RHBA-2026:19710.

New features and improvements

Windows Server 2025 support

The WMCO now supports Windows Server 2025, OS Build 10.0.26100 or later for all supported platforms.

Kubernetes upgrade

The WMCO now uses Kubernetes version 1.35.

Bug fixes

• Before this update, if you enabled the ClusterAPIMachineManagement feature gate by enabling the TechPreviewNoUpgrade feature set, OpenShift Container Platform provisioned the openshift-cluster-api namespace. However, the WMCO was not adding the windows-user-data secret to that namespace, which is required by Cluster API compute machine sets. Because of the missing secret, CAPI-provisioned Windows machines would not bootstrap, remaining stuck in the Pending phase, and never joining the cluster. With this release, the OpenShift Container Platform now detects whether the openshift-cluster-api namespace exists and mirrors the windows-user-data secret into that namespace. CAPI-provisioned Windows machines successfully receive the bootstrap secret, are no longer getting stuck in Pending state, and join the cluster as expected. (OCPBUGS-38401)