CVE-2026-54100: A flaw was found in the Windows Machine Config Operator (WMCO) for Red Hat OpenShift Container Platform

This month

HIGH 8.3WATCHLISTUPGRADEMITIGATE

CVE-2026-54100 is a high-severity flaw (CVSS 8.3) affecting openshift container platform, windows machine config operator. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.3 (High)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-295
Published	2026-06-22
Last modified	2026-10-14

Publisher (CNA): Red Hat, Inc. · Vendor: redhat

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-22 14:17 UTCPublished CVE record published
2026-10-14 03:17 UTCUpdated Record last modified

redhat openshift container platform UPGRADE

Affected: >= 4.0 and <= 4.22.1

Fixed in: newer than 4.22.1

Safe to downgrade to: a release before 4.0

1. Check installed version

apt-cache policy openshift-container-platform || rpm -q openshift-container-platform || openshift-container-platform --version

2. UPGRADE to newer than 4.22.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade openshift-container-platform

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade openshift-container-platform

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 4.0 (Debian / Ubuntu)

apt-cache madison openshift-container-platform sudo apt install openshift-container-platform=<VERSION_BEFORE_4.0> sudo apt-mark hold openshift-container-platform

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list openshift-container-platform sudo dnf downgrade openshift-container-platform-<VERSION_BEFORE_4.0> sudo dnf versionlock add openshift-container-platform

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

redhat windows machine config operator MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy windows-machine-config-operator || rpm -q windows-machine-config-operator || windows-machine-config-operator --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-54100?

openshift container platform: upgrade to newer than 4.22.1; windows machine config operator: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-54100 being exploited?

CVE-2026-54100 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-54100 affect?

CVE-2026-54100 affects openshift container platform, windows machine config operator. Severity is high (CVSS 8.3). 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

How urgent is CVE-2026-54100?

Priority 40/100. High severity; On your watchlist

Software pages

Windows vulnerabilities · Red Hat OpenShift vulnerabilities · Bootstrap vulnerabilities

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References

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