CVE-2026-16242

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-16242", "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "state": "PUBLISHED", "assignerShortName": "redhat", "dateReserved": "2026-07-20T05:06:35.638Z", "datePublished": "2026-07-20T07:33:16.712Z", "dateUpdated": "2026-09-14T14:46:53.965Z"}, "containers": {"cna": {"title": "Hypershift: konnectivity proxy-server accepts agent connections without validating client certificates", "metrics": [{"other": {"content": {"value": "Critical", "namespace": "https://access.redhat.com/security/updates/classification/"}, "type": "Red Hat severity rating"}}, {"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 9.4, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L", "version": "3.1"}, "format": "CVSS"}], "descriptions": [{"lang": "en", "value": "A flaw was found in the Konnectivity proxy-server configuration for hosted control planes. The agent-facing listener was started without --cluster-ca-cert (and without token-based agent authentication), so client certificates were not validated. A remote attacker who can reach the Konnectivity cluster endpoint could connect as an unauthenticated agent, join the routing pool, and potentially proxy, inspect, modify, or drop control-plane-to-node traffic."}], "affected": [{"vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.1", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "multicluster-engine/hypershift-rhel9-operator", "defaultStatus": "affected", "versions": [{"version": "1784905766", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": ["cpe:/a:redhat:multicluster_engine:2.10::el9"]}, {"vendor": "Red Hat", "product": "multicluster engine for Kubernetes 2.1", "collectionURL": "https://catalog.redhat.com/software/containers/", "packageName": "multicluster-engine/hypershift-rhel9-operator", "defaultStatus": "affected", "versions": [{"version": "1784905766", "lessThan": "*", "versionType": "rpm", "status": "unaffected"}], "cpes": 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"collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "openshift4/ose-powervs-block-csi-driver-rhel9-operator", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:openshift:4"]}, {"vendor": "Red Hat", "product": "Red Hat OpenShift Container Platform 4", "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "packageName": "openshift4/ose-smb-csi-driver-rhel9-operator", "defaultStatus": "unaffected", "cpes": ["cpe:/a:redhat:openshift:4"]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2026:46885", "name": "RHSA-2026:46885", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:47388", "name": "RHSA-2026:47388", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:47728", "name": "RHSA-2026:47728", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:47735", "name": "RHSA-2026:47735", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:47949", "name": "RHSA-2026:47949", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:47953", "name": "RHSA-2026:47953", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:47974", "name": "RHSA-2026:47974", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:48284", "name": "RHSA-2026:48284", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:48657", "name": "RHSA-2026:48657", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:48670", "name": "RHSA-2026:48670", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:48676", "name": "RHSA-2026:48676", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:48693", "name": "RHSA-2026:48693", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:48699", "name": "RHSA-2026:48699", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:50758", "name": "RHSA-2026:50758", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:56789", "name": "RHSA-2026:56789", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/errata/RHSA-2026:56912", "name": "RHSA-2026:56912", "tags": ["vendor-advisory", "x_refsource_REDHAT"]}, {"url": "https://access.redhat.com/security/cve/CVE-2026-16242", "tags": ["vdb-entry", "x_refsource_REDHAT"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502690", "name": "RHBZ#2502690", "tags": ["issue-tracking", "x_refsource_REDHAT"]}, {"url": "https://github.com/openshift/hypershift/pull/9031"}], "datePublic": "2026-07-17T00:00:00.000Z", "problemTypes": [{"descriptions": [{"cweId": "CWE-306", "description": "Missing Authentication for Critical Function", "lang": "en", "type": "CWE"}]}], "x_redhatCweChain": "CWE-306: Missing Authentication for Critical Function", "workarounds": [{"lang": "en", "value": "Until an update that configures Konnectivity agent authentication is applied, restrict network access to the Konnectivity cluster (agent) endpoint so that only trusted worker networks can reach it. For NodePort or LoadBalancer publishing, limit ingress to port 8091 to worker node subnet ranges. For Route-based publishing, restrict access to the Konnectivity route to trusted networks where possible. These controls reduce the chance that an unauthenticated attacker can reach the agent listener; they do not replace proper agent client-certificate (or token) authentication."}], "timeline": [{"lang": "en", "time": "2026-07-20T04:50:48.621Z", "value": "Reported to Red Hat."}, {"lang": "en", "time": "2026-07-17T00:00:00.000Z", "value": "Made public."}], "credits": [{"lang": "en", "value": "Red Hat would like to thank Microsoft Security Research (MSRC) (Microsoft) for reporting this issue."}], "providerMetadata": {"orgId": "53f830b8-0a3f-465b-8143-3b8a9948e749", "shortName": "redhat", "dateUpdated": "2026-09-14T14:46:53.965Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-07-21T14:56:23.371685Z", "id": "CVE-2026-16242", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-07-21T14:59:44.396Z"}}]}}

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{"acknowledgement": "Red Hat would like to thank Microsoft Security Research (MSRC) (Microsoft) for reporting this issue.", "bugzilla": {"description": "hypershift: Konnectivity proxy-server accepts agent connections without validating client certificates", "id": "2502690", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502690"}, "csaw": false, "cvss3": {"cvss3_base_score": "9.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L", "status": "draft"}, "cwe": "CWE-306", "details": ["A flaw was found in the Konnectivity proxy-server configuration for hosted control planes. The agent-facing listener was started without --cluster-ca-cert (and without token-based agent authentication), so client certificates were not validated. A remote attacker who can reach the Konnectivity cluster endpoint could connect as an unauthenticated agent, join the routing pool, and potentially proxy, inspect, modify, or drop control-plane-to-node traffic."], "mitigation": {"lang": "en:us", "value": "Until an update that configures Konnectivity agent authentication is applied, restrict network access to the Konnectivity cluster (agent) endpoint so that only trusted worker networks can reach it. For NodePort or LoadBalancer publishing, limit ingress to port 8091 to worker node subnet ranges. For Route-based publishing, restrict access to the Konnectivity route to trusted networks where possible. These controls reduce the chance that an unauthenticated attacker can reach the agent listener; they do not replace proper agent client-certificate (or token) authentication."}, "name": "CVE-2026-16242", "package_state": [{"cpe": "cpe:/a:redhat:logging:6", "fix_state": "Affected", "package_name": "openshift-logging/cluster-logging-rhel9-operator", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/cluster-curator-controller-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/hypershift-addon-rhel9-operator", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": "cpe:/a:redhat:multicluster_engine", "fix_state": "Affected", "package_name": "multicluster-engine/hypershift-cli-rhel9", "product_name": "Multicluster Engine for Kubernetes"}, {"cpe": 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"product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-hypershift-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-hypershift-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-openstack-cinder-csi-driver-rhel9-operator", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-powervs-block-csi-driver-rhel9-operator", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-smb-csi-driver-rhel9-operator", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-07-17T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-16242\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-16242\nhttps://github.com/openshift/hypershift/pull/9031"], "statement": "A flaw in the Konnectivity proxy-server used by hosted control planes allows a remote, unauthenticated attacker who can reach the agent-facing (cluster) endpoint to establish an agent connection without presenting a client certificate signed by the hosted cluster\u2019s Konnectivity CA, and without using token-based agent authentication. 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