CVE-2026-54100
Windows-machine-config-operator: windows-machine-config-operator: ssh host key not verified enables credential theft
HIGH 8.3
At a glance
- Source
- NVD
- EPSS
- EPSS 0.30 % · percentile 23 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Modified
Description
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.
Weaknesses (CWE)
- CWE-295 — Improper Certificate Validation
References
- https://access.redhat.com/errata/RHSA-2026:47173
- https://access.redhat.com/errata/RHSA-2026:61780
- https://access.redhat.com/errata/RHSA-2026:81397
- https://access.redhat.com/errata/RHSA-2026:82440
- https://access.redhat.com/security/cve/CVE-2026-54100
- https://bugzilla.redhat.com/show_bug.cgi?id=2487953
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54100.json
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.3 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H | redhat |
| CVSS 3.1 | HIGH 8.3 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H | redhat-SADP |
| CVSS 3.1 | HIGH 8.3 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H | NVD · secalert@redhat.com (Secondary) |
| CVSS 3.1 | HIGH 8.3 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H | NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary) |
European references
- ENISA EUVD · EUVD-2026-38234
- GCVE · GCVE-0-2026-54100
Affected configurations (NVD CPE)
cpe:2.3:a:redhat:openshift_container_platform:*:*:*:*:*:*:*:*≥ 4.0 ≤ 4.22.1cpe:2.3:a:redhat:windows_machine_config_operator:-:*:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Red Hat · Red Hat OpenShift for Windows Containers 10.19 | unaffected 1789075615 < * |
| Red Hat · Red Hat OpenShift for Windows Containers 10.20 | unaffected 1789075603 < * |
| Red Hat · Red Hat OpenShift for Windows Containers 10.21 | unaffected 1787065708 < * |
| Red Hat · Red Hat OpenShift for Windows Containers 10.22 | unaffected 1783692800 < * |
| Red Hat · Red Hat OpenShift Container Platform 4 | |
| Red Hat · Red Hat OpenShift Container Platform 4 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |