CVE-2026-19706

Full vulnerability record from the local CVENow database.
Description

During ABI bootstrap, the bootstrap node's approve-csr.service approves and signs every CSR without identity validation. An attacker on the install network can retrieve the unauthenticated Ignition file (ports 22623/22624), extract a limited kubeconfig, submit a CSR for CN=system:admin, receive the signed certificate, and gain full cluster-admin access. Exploitable only during the narrow bootstrap window.
Severity
HIGH
CVSS score
8.3 (v3.1)
Vulnerability status
Awaiting Analysis
Source identifier
[email protected]
Published
2026-11-09 18:17:27.583000
Last modified
2026-11-09 23:17:22.743000
View original CVE JSON
{
  "id": "CVE-2026-19706",
  "sourceIdentifier": "[email protected]",
  "published": "2026-11-09T18:17:27.583",
  "lastModified": "2026-11-09T23:17:22.743",
  "vulnStatus": "Awaiting Analysis",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "During ABI bootstrap, the bootstrap node's approve-csr.service approves and signs every CSR without identity validation.\n\nAn attacker on the install network can retrieve the unauthenticated Ignition file (ports 22623/22624), extract a limited kubeconfig, submit a CSR for CN=system:admin, receive the signed certificate, and gain full cluster-admin access.\n\nExploitable only during the narrow bootstrap window."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
        {
          "vendor": "Red Hat",
          "product": "Assisted Installer for Red Hat OpenShift Container Platform 2",
          "defaultStatus": "unaffected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "assisted/agent-preinstall-image-builder-rhel9",
          "cpes": [
            "cpe:/a:redhat:assisted_installer:2"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Assisted Installer for Red Hat OpenShift Container Platform 2",
          "defaultStatus": "affected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "rhai/assisted-installer-agent-rhel9",
          "cpes": [
            "cpe:/a:redhat:assisted_installer:2"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Assisted Installer for Red Hat OpenShift Container Platform 2",
          "defaultStatus": "affected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "rhai/assisted-installer-controller-rhel9",
          "cpes": [
            "cpe:/a:redhat:assisted_installer:2"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Multicluster Engine for Kubernetes",
          "defaultStatus": "affected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "multicluster-engine/assisted-installer-agent-rhel8",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Multicluster Engine for Kubernetes",
          "defaultStatus": "affected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "multicluster-engine/assisted-installer-agent-rhel9",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Multicluster Engine for Kubernetes",
          "defaultStatus": "affected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "multicluster-engine/assisted-installer-controller-rhel8",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Multicluster Engine for Kubernetes",
          "defaultStatus": "affected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "multicluster-engine/assisted-installer-controller-rhel9",
          "cpes": [
            "cpe:/a:redhat:multicluster_engine"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 4",
          "defaultStatus": "affected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "openshift4/ose-agent-installer-csr-approver-rhel8",
          "cpes": [
            "cpe:/a:redhat:openshift:4"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 4",
          "defaultStatus": "affected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "openshift4/ose-agent-installer-csr-approver-rhel9",
          "cpes": [
            "cpe:/a:redhat:openshift:4"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 4",
          "defaultStatus": "unaffected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "openshift4/ose-agent-installer-orchestrator-rhel8",
          "cpes": [
            "cpe:/a:redhat:openshift:4"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 4",
          "defaultStatus": "unaffected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "openshift4/ose-agent-installer-orchestrator-rhel9",
          "cpes": [
            "cpe:/a:redhat:openshift:4"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 5",
          "defaultStatus": "affected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "openshift5/ose-agent-installer-csr-approver-rhel9",
          "cpes": [
            "cpe:/a:redhat:openshift:5"
          ]
        },
        {
          "vendor": "Red Hat",
          "product": "Red Hat OpenShift Container Platform 5",
          "defaultStatus": "unaffected",
          "collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
          "packageName": "openshift5/ose-agent-installer-orchestrator-rhel9",
          "cpes": [
            "cpe:/a:redhat:openshift:5"
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "[email protected]",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 8.3,
          "baseSeverity": "HIGH",
          "attackVector": "ADJACENT_NETWORK",
          "attackComplexity": "HIGH",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.6,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-11-09T22:44:42.460170Z",
          "id": "CVE-2026-19706",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "weaknesses": [
    {
      "source": "[email protected]",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-306"
        }
      ]
    }
  ],
  "references": [
    {
      "url": "https://access.redhat.com/security/cve/CVE-2026-19706",
      "source": "[email protected]"
    },
    {
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2515215",
      "source": "[email protected]"
    },
    {
      "url": "https://docs.redhat.com/en/documentation/openshift_container_platform/4.22/html/installing_an_on-premise_cluster_with_the_agent-based_installer/index",
      "source": "[email protected]"
    },
    {
      "url": "https://kubernetes.io/docs/reference/access-authn-authz/certificate-signing-requests/",
      "source": "[email protected]"
    }
  ]
}