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
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
- Published by Microsoft Security Response Center
The publication date reported by the vendor.
- Updated by Microsoft Security Response Center
The vendor changed the advisory after it was first published.
- Added to SecurityAlert
We collected the advisory from the official source.
- Confirmed at the source
Our collector saw this advisory during a later source check.