{
  "cveId": "CVE-2026-23666",
  "url": "https://patchblox.com/security/cve/CVE-2026-23666",
  "summary": "CVE-2026-23666 is fixed in 49 products on 1 platform, first by KB5082413, released April 14, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": ".NET Framework Denial of Service Vulnerability",
  "description": "\u003Cp\u003EImproper input validation in .NET Framework allows an unauthorized attacker to deny service over a network.\u003C/p\u003E",
  "published": "2026-04-15T07:00:00Z",
  "severity": "Critical",
  "cvss": 7.5,
  "cwe": "Improper Handling of Exceptional Conditions",
  "epss": 0.0133,
  "epssPercentile": 0.71216,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23666",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5082413",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082413",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082413",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082413",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082413",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082413",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5082414",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082414",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082414",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082414",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082414",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082414",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5082426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082426",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082426",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082426",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5082426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082426",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082426",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082426",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022",
      "fixedVersion": "",
      "fix": "KB5082427",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082427",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082427",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082427",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5082419",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082419",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082419",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082419",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082419",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082419",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5082419",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082419",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082419",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082419",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082419",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082419",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 22H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082424",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082424",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 22H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082424",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082424",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082424",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082424",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082424",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082424",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082420",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082420",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082420",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082420",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082417",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082417",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082417",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082417",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082421",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082421",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 version 26H1 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082421",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082421",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022",
      "fixedVersion": "",
      "fix": "KB5082425",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082425",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082425",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082425",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022, 23H2 Edition (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082418",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082418",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025",
      "fixedVersion": "",
      "fix": "KB5082417",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082417",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2025 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082417",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082417",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 on Windows Server 2012",
      "fixedVersion": "",
      "fix": "KB5082398",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082398",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082398",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082398",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 on Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB5082406",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082406",
      "released": "2026-04-15T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082406",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082406",
      "released": "2026-04-15T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012",
      "fixedVersion": "",
      "fix": "KB5082400",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082400",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082400",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082400",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB5082402",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082402",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082402",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082402",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems",
      "fixedVersion": "",
      "fix": "KB5082411",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082411",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems",
      "fixedVersion": "",
      "fix": "KB5082411",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082411",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.8 on Windows Server 2012",
      "fixedVersion": "",
      "fix": "KB5082403",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082403",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082403",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082403",
      "released": "2026-04-14T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.8 on Windows Server 2012 R2",
      "fixedVersion": "",
      "fix": "KB5082404",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082404",
      "released": "2026-04-15T07:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)",
      "fixedVersion": "",
      "fix": "KB5082404",
      "url": "https://patchblox.com/security/fix/microsoft/kb5082404",
      "released": "2026-04-15T07:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}