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Microsoft Security Response CenterCVE-2026-50646

.NET Framework Remote Code Execution Vulnerability

Protection mechanism failure in .NET Framework allows an unauthorized attacker to execute code locally.

Read the vendor bulletin Get alerts for Microsoft .NET Framework 4.8 on Windows Server
7.8CVSS out of 10High severity
Scope

What the vendor says is affected

  • Microsoft .NET Framework 4.8 on Windows Server 2012
  • Microsoft .NET Framework 4.8 on Windows Server 2016 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016
  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 R2
  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 24H2 for ARM64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 23H2 for x64-based Systems
  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems
  • .NET 8.0 installed on Windows
  • .NET 9.0 installed on Windows
  • Microsoft Visual Studio 2026 version 18.7
  • Microsoft Visual Studio 2022 version 17.12
  • Microsoft Visual Studio 2022 version 17.14
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems
  • Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for x64-based Systems
  • Microsoft .NET Framework 4.8 on Windows Server 2016
  • Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)

Versions the vendor lists as fixed

  • 4.8.4803.0
  • 2.0.50727.9069 & 3.0.30729.9067 & 4.8.4803.0
  • 2.0.50727.9182 & 3.0.30729.9168 & 4.8.4803.0
  • 2.0.50727.8983 & 3.0.30729.8978 & 4.7.4143.0
  • 4.7.4143.0
  • 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9339.0
  • 2.0.50727.9182 & 3.0.30729.9168
  • 4.8.9340.0
  • 8.0.29
  • 9.0.18
  • 18.7.4
  • 17.12.22
  • 17.14.36
  • 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0
  • 2.0.50727.9182 & 3.0.30729.9168 & 4.8.9340.0
  • 2.0.50727.8983 & 3.0.30729.8978
Next step

What the vendor recommends

Release Notes Install KB5101009. Install KB5101007. Install KB5101008. Install KB5101006. Install KB5099535. Install KB5100991. Install KB5100990. Install KB5101000. Install KB5101004. Install KB5101001. Install KB5101014. Install KB5101002. Install KB5104032. Install KB5104033. Install KB5101011. Install KB5101010. Install KB5100989. Install KB5101005. Install KB5100998. Install KB5100984. Install KB5100985.

Review the complete instructions on the vendor's site
Timeline

When this advisory changed

  1. Published by Microsoft Security Response Center

    The publication date reported by the vendor.

  2. Updated by Microsoft Security Response Center

    The vendor changed the advisory after it was first published.

  3. Added to SecurityAlert

    We collected the advisory from the official source.

Vulnerabilities

CVEs named in this advisory

CVE-2026-50646View CVSS, KEV, EPSS, and threat context
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