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Microsoft Security Response CenterCVE-2026-50649

.NET Remote Code Execution Vulnerability

HighVendor CVSS 7.8 / 10 1 CVE Published Jul 14, 2026 at 7:00 AM UTC
Get alerts for NET 8.0 runtime installed on Windows

Summary

Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code locally.

Products covered

  • .NET 8.0 runtime installed on Windows

  • .NET 9.0 runtime installed on Windows

  • Microsoft .NET Framework 3.5 on Windows 11 version 26H1 for x64-based Systems

  • Microsoft .NET Framework 4.8.1 on Windows 11 version 26H1 for x64-based Systems

  • Microsoft .NET Framework 3.5 on Windows 11 Version 26H1 for ARM64-based Systems

  • Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-based Systems

  • Microsoft Visual Studio 2026 version 18.7

  • Microsoft .NET Framework 4.8 on Windows 10 Version 1607 for 32-bit Systems

Show 49 more products

  • 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 2016 (Server Core installation)

  • Microsoft .NET Framework 4.8 on Windows Server 2012

  • Microsoft .NET Framework 4.8 on Windows Server 2012 (Server Core installation)

  • Microsoft .NET Framework 4.8 on Windows Server 2012 R2

  • Microsoft .NET Framework 4.8 on Windows Server 2012 R2 (Server Core installation)

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for 32-bit Systems

  • 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 Server 2019

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2019 (Server Core installation)

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows Server 2022 (Server Core installation)

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 21H2 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 4.8 on Windows 10 Version 22H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 22H2 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2019 (Server Core installation)

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1607 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows Server 2016 (Server Core installation)

  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012

  • Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2 on Windows Server 2012 (Server Core installation)

  • 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 R2 (Server Core installation)

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows Server 2022 (Server Core installation)

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 21H2 for 32-bit Systems

  • 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 10 Version 21H2 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for x64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 10 Version 22H2 for 32-bit Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.8.1 on Windows 11 Version 25H2 for x64-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 23H2 for x64-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 24H2 for x64-based Systems

  • Microsoft .NET Framework 3.5 on Windows Server 2012

  • Microsoft .NET Framework 3.5 on Windows Server 2012 (Server Core installation)

  • Microsoft .NET Framework 3.5 on Windows Server 2012 R2

  • Microsoft .NET Framework 3.5 on Windows Server 2012 R2 (Server Core installation)

Remediation

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

Vendor-listed fixes

  • 8.0.29

  • 9.0.18

  • 2.0.50727.9182 & 3.0.30729.9168

  • 4.8.9340.0

  • 18.7.4

  • 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

Show 6 more fixes

  • 2.0.50727.9069 & 3.0.30729.9067 & 4.7.4143.0

  • 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

  • 2.0.50727.8983 & 3.0.30729.8978

CVEs in this advisory 1

CVE-2026-50649
Update history

What changed in later vendor updates

SecurityAlert records field-level changes from the point we begin following a bulletin. Earlier vendor changes may not have a field-by-field record.

    • Added affected products: .NET 8.0 runtime installed on Windows, .NET 9.0 runtime installed on Windows.
    • Removed affected products: .NET 8.0 installed on Windows, .NET 9.0 installed on Windows.

Updates

  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.

  4. Confirmed at the source

    Our collector saw this advisory during a later source check.

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