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KB5126145

.NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H2

Support article Update Catalog CVEs in Security CVE list for a ticket

.NET Framework servicing update

Microsoft Support

Framework servicing is separate from the Windows OS update. Microsoft's article provides applicability and security fixes; test the framework versions installed on your servers.

Applies to

Windows 10, version 21H2Windows 10, version 22H2

Related packages

KB5126046KB5126421
Security improvements · 2 CVEs named by Microsoft
CVE-2026-62886CVE-2026-69522

Source: Microsoft Support · 8 Sep 2026

Companion updates for this Windows version

Same patch cycle

Windows and .NET Framework are serviced separately. These packages target the same Windows version; choose the framework packages that apply to your installation.

8 Sep 2026

Companion updates do not replace this KB or establish an installation prerequisite.

2CVEs fixed · 0 critical
0Exploited or in CISA KEV

Security fixes

2 Microsoft CVEs · most urgent first
CVE Vulnerability Severity CVSSEPSSImpact Status
CVE-2026-69522 .NET and Visual Studio Remote Code Execution VulnerabilityVisual Studio Important 8.80.9%RCENetwork Revised 29 Sep
CVE-2026-62886 .NET Elevation of Privilege Vulnerability.NET Important 7.80.5%EoPLocal Revised 17 Aug

What changed

First observed 20 Oct 2026

No field changes in the recorded history.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 20 Oct 10:42 UTC · 258 of 260 readable · 256 fully read · documentation 416/439 current

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