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Microsoft Security Response CenterCVE-2026-62897

.NET Framework Remote Code Execution Vulnerability

HighVendor CVSS 7.0 / 10 1 CVE Published Aug 11, 2026 at 7:00 AM UTC

Summary

Integer overflow or wraparound in .NET Framework allows an unauthorized attacker to execute code locally.

Products covered

  • Microsoft .NET Framework 4.8.1 on Windows 11 Version 26H1 for ARM64-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 x64-based Systems

  • .NET 10.0 installed on Windows

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

  • .NET 8.0 installed on Windows

  • .NET 9.0 installed on Windows

  • Microsoft Visual Studio 2026 version 18.8

Show 3 more products
  • Microsoft Visual Studio 2022 version 17.14

  • Microsoft .NET Framework 3.5 AND 4.8 on Windows 10 Version 1809 for ARM64-based Systems

  • Microsoft .NET Framework 3.5 AND 4.7.2 on Windows 10 Version 1809 for ARM64-based Systems

Remediation

Install KB5120711. Install KB5120747. Install KB5122106. Install KB5122104. Install KB5122105. Install KB5120703. Install KB5120698.

Vendor-listed fixes

  • 4.8.9344.0

  • 2.0.50727.9183 & 3.0.30729.9169

  • 10.0.11

  • 8.0.30

  • 9.0.19

  • 18.8.3

  • 17.14.38

  • 2.0.50727.9070 & 3.0.30729.9068 & 4.8.4805.0

Show 1 more fixes
  • 2.0.50727.9070 & 3.0.30729.9068 & 4.7.4144.0

CVEs in this advisory 1

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.

    • The vendor changed its remediation guidance.

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.