{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Important" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-54100.json" } ], "title": "windows-machine-config-operator: windows-machine-config-operator: SSH host key not verified enables credential theft", "tracking": { "current_release_date": "2026-07-28T16:03:22+00:00", "generator": { "date": "2026-07-28T16:03:22+00:00", "engine": { "name": "Red Hat SDEngine", "version": "5.3.7" } }, "id": "CVE-2026-54100", "initial_release_date": "2026-06-10T00:00:00+00:00", "revision_history": [ { "date": "2026-06-10T00:00:00+00:00", "number": "1", "summary": "Initial version" }, { "date": "2026-06-22T14:01:11+00:00", "number": "2", "summary": "Current version" }, { "date": "2026-07-28T16:03:22+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Red Hat OpenShift Container Platform 4", "product": { "name": "Red Hat OpenShift Container Platform 4", "product_id": "red_hat_openshift_container_platform_4", "product_identification_helper": { "cpe": "cpe:/a:redhat:openshift:4" } } } ], "category": "product_family", "name": "Red Hat OpenShift Container Platform 4" }, { "branches": [ { "category": "product_name", "name": "Red Hat OpenShift for Windows Containers 10.22", "product": { "name": "Red Hat OpenShift for Windows Containers 10.22", "product_id": "Red Hat OpenShift for Windows Containers 10.22", "product_identification_helper": { "cpe": "cpe:/a:redhat:windows_machine_config:10.22::el9" } } } ], "category": "product_family", "name": "Red Hat OpenShift for Windows Containers" }, { "category": "product_version", "name": "openshift4-wincw/windows-machine-config-rhel8-operator", "product": { "name": "openshift4-wincw/windows-machine-config-rhel8-operator", "product_id": "openshift4-wincw/windows-machine-config-rhel8-operator", "product_identification_helper": { "purl": "pkg:oci/windows-machine-config-rhel8-operator@8.1.3-16?repository_url=registry.redhat.io/openshift4-wincw/windows-machine-config-rhel8-operator" } } }, { "category": "product_version", "name": "openshift4-wincw/windows-machine-config-rhel9-operator", "product": { "name": "openshift4-wincw/windows-machine-config-rhel9-operator", "product_id": "openshift4-wincw/windows-machine-config-rhel9-operator", "product_identification_helper": { "purl": "pkg:oci/windows-machine-config-rhel9-operator@10.16.1-2.1745841799?repository_url=registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator" } } }, { "branches": [ { "category": "product_version", "name": "registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64", "product": { "name": "registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64", "product_id": "registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64", "product_identification_helper": { "purl": "pkg:oci/windows-machine-config-operator-bundle@sha256%3A6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71?arch=amd64&repository_url=registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle&tag=1783955949" } } }, { "category": "product_version", "name": "registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64", "product": { "name": "registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64", "product_id": "registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64", "product_identification_helper": { "purl": "pkg:oci/windows-machine-config-rhel9-operator@sha256%3A3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f?arch=amd64&repository_url=registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator&tag=1783692800" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "Red Hat" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64 as a component of Red Hat OpenShift for Windows Containers 10.22", "product_id": "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64" }, "product_reference": "registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64", "relates_to_product_reference": "Red Hat OpenShift for Windows Containers 10.22" }, { "category": "default_component_of", "full_product_name": { "name": "registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64 as a component of Red Hat OpenShift for Windows Containers 10.22", "product_id": "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64" }, "product_reference": "registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64", "relates_to_product_reference": "Red Hat OpenShift for Windows Containers 10.22" }, { "category": "default_component_of", "full_product_name": { "name": "openshift4-wincw/windows-machine-config-rhel8-operator as a component of Red Hat OpenShift Container Platform 4", "product_id": "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel8-operator" }, "product_reference": "openshift4-wincw/windows-machine-config-rhel8-operator", "relates_to_product_reference": "red_hat_openshift_container_platform_4" }, { "category": "default_component_of", "full_product_name": { "name": "openshift4-wincw/windows-machine-config-rhel9-operator as a component of Red Hat OpenShift Container Platform 4", "product_id": "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel9-operator" }, "product_reference": "openshift4-wincw/windows-machine-config-rhel9-operator", "relates_to_product_reference": "red_hat_openshift_container_platform_4" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-54100", "cwe": { "id": "CWE-295", "name": "Improper Certificate Validation" }, "discovery_date": "2026-06-11T00:00:00+00:00", "flags": [ { "label": "vulnerable_code_not_present", "product_ids": [ "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64" ] } ], "ids": [ { "system_name": "Red Hat Bugzilla ID", "text": "2487953" } ], "notes": [ { "category": "description", "text": "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.", "title": "Vulnerability description" }, { "category": "summary", "text": "windows-machine-config-operator: windows-machine-config-operator: SSH host key not verified enables credential theft", "title": "Vulnerability summary" }, { "category": "other", "text": "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.", "title": "Statement" }, { "category": "general", "text": "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.", "title": "CVSS score applicability" } ], "product_status": { "fixed": [ "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64" ], "known_affected": [ "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel8-operator", "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel9-operator" ], "known_not_affected": [ "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://access.redhat.com/security/cve/CVE-2026-54100" }, { "category": "external", "summary": "RHBZ#2487953", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2487953" }, { "category": "external", "summary": "https://www.cve.org/CVERecord?id=CVE-2026-54100", "url": "https://www.cve.org/CVERecord?id=CVE-2026-54100" }, { "category": "external", "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-54100", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-54100" } ], "release_date": "2026-06-10T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2026-07-28T16:01:42+00:00", "details": "For Windows Machine Config Operator upgrades, see the following documentation: https://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/windows_container_support_for_openshift/windows-node-upgrades", "product_ids": [ "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64" ], "url": "https://access.redhat.com/errata/RHSA-2026:47173" }, { "category": "workaround", "details": "At this time, no mitigation or workaround is available for this vulnerability. Customers are advised to apply the appropriate updates as they become available.", "product_ids": [ "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64", "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel8-operator", "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel9-operator" ] }, { "category": "none_available", "details": "Affected", "product_ids": [ "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel8-operator", "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel9-operator" ] } ], "scores": [ { "cvss_v3": { "attackComplexity": "HIGH", "attackVector": "ADJACENT_NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1" }, "products": [ "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64", "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64", "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel8-operator", "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel9-operator" ] } ], "threats": [ { "category": "impact", "details": "Important", "product_ids": [ "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-operator-bundle@sha256:6c20b766b0c63111d59d3c0b46b248e03f41a8fe2559f5c7a108cb1738f22b71_amd64", "Red Hat OpenShift for Windows Containers 10.22:registry.redhat.io/openshift4-wincw/windows-machine-config-rhel9-operator@sha256:3aacd9560f3408becf4b3618590a620d72aff0313a5efb23542552a6fd59500f_amd64", "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel8-operator", "red_hat_openshift_container_platform_4:openshift4-wincw/windows-machine-config-rhel9-operator" ] } ], "title": "windows-machine-config-operator: windows-machine-config-operator: SSH host key not verified enables credential theft" } ] }