{
  "fix": "KB5082426",
  "url": "https://patchblox.com/security/fix/microsoft/kb5082426",
  "summary": "KB5082426, released April 14, 2026, fixes 3 CVEs across 9 products. None of them is reported as exploited. Patch Radar priority: Urgent.",
  "platform": "microsoft",
  "type": "kb",
  "releaseKind": "Security",
  "title": "April 2026 security update",
  "released": "2026-04-14T07:00:00Z",
  "priority": "Urgent",
  "priorityTier": 2,
  "priorityReason": "Closes CVE-2026-23666, rated Critical",
  "supported": true,
  "cveCount": 3,
  "exploitedCveCount": 0,
  "kevCveCount": 0,
  "ransomwareCveCount": 0,
  "maxEpss": 0.02142,
  "maxCvss": 7.5,
  "vendorAdvisory": "https://support.microsoft.com/help/5082426",
  "appliesTo": [
    {
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-10-version-21h2-for-32-bit-systems",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-10-version-21h2-for-arm64-based-systems",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-10-version-21h2-for-x64-based-systems",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-10-version-22h2-for-32-bit-systems",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-10-version-22h2-for-arm64-based-systems",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-10-version-22h2-for-x64-based-systems",
      "fixedVersion": "",
      "supported": true
    },
    {
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 11 version 21H2 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-11-version-21h2-for-x64-based-systems",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows Server, version 20H2 (Server Core Installation)",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-3.5-and-4.8-on-windows-server-version-20h2-server-core-installation",
      "fixedVersion": "",
      "supported": false
    },
    {
      "product": "Microsoft .NET Framework 4.8 on Windows 10 Version 22H2 for x64-based Systems",
      "productUrl": "https://patchblox.com/security/product/microsoft/microsoft-.net-framework-4.8-on-windows-10-version-22h2-for-x64-based-systems",
      "fixedVersion": "",
      "supported": false
    }
  ],
  "cves": [
    {
      "cveId": "CVE-2026-23666",
      "url": "https://patchblox.com/security/cve/CVE-2026-23666",
      "title": ".NET Framework Denial of Service Vulnerability",
      "component": ".NET Framework",
      "impact": "Denial of Service",
      "priority": "Urgent",
      "severity": "Critical",
      "cvss": 7.5,
      "epss": 0.0133,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-33116",
      "url": "https://patchblox.com/security/cve/CVE-2026-33116",
      "title": ".NET, .NET Framework, and Visual Studio Denial of Service Vulnerability",
      "component": ".NET, .NET Framework, Visual Studio",
      "impact": "Denial of Service",
      "priority": "High",
      "severity": "Important",
      "cvss": 7.5,
      "epss": 0.02142,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    },
    {
      "cveId": "CVE-2026-32226",
      "url": "https://patchblox.com/security/cve/CVE-2026-32226",
      "title": ".NET Framework Denial of Service Vulnerability",
      "component": ".NET Framework",
      "impact": "Denial of Service",
      "priority": "Routine",
      "severity": "Important",
      "cvss": 5.9,
      "epss": 0.00542,
      "kev": false,
      "ransomware": false,
      "exploited": false,
      "disclosed": false
    }
  ],
  "dataAsOf": "2026-11-07T06:34:28Z"
}