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Recorded 19 Oct 2026 at 15:12 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.

.NET Framework updateMicrosoft Learn and Support

KB5126052

September 8, 2026-KB5126052 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2, Windows 11, version 25H2 and Microsoft server operating system 24H2

What it said

KB
KB5126052
Applies to
Windows 11, version 24H2; Windows 11, version 25H2; Windows Server 2025
Related KBs
CVEs named by Microsoft
CVE-2026-62886, CVE-2026-69522
Readiness
This is a .NET Framework servicing update, not a Windows OS build. Review Microsoft's support article and test the applicable framework versions; OS release-health coverage does not establish this update's deployment readiness.
Windows versions and builds
Not in the collected release tables
Restart required
Not stated in collected security fixes
CVEs fixed
CVE-2026-69522, CVE-2026-62886
Known issues caused
None in the collected release health data
Known issues resolved
None in the collected release health data
Included security update
None identified in the collected release tables
CVEs listed directly for this KB
CVE-2026-69522, CVE-2026-62886
Missing security release
None identified in collected security coverage

Source evidence when recorded

dotnet-framework-updates
IncompleteRead 19 Oct 2026 at 15:11 UTC
Microsoft security releases
Complete at observationRead 19 Oct 2026 at 15:11 UTC

Coverage describes the sources at this observation. A complete read then does not establish their current position.

What changed

  1. Security fixes updated · Applies to: 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 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 Server 2025 → Windows 11, version 24H2; Windows 11, version 25H2; Windows Server 2025
Page history

Changes are dated when recorded; day views use the last saved version from that UTC day, and citations stay fixed.

Cite this version
Field-level log (12)

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  1. 19 Oct 2026 · 15:12:40 UTC ReadinessThis is a .NET Framework servicing update, not a Windows OS build. Review Microsoft's support article and test the applicable framework versions; OS release-health coverage does not establish this update's deployment readiness.
  2. 19 Oct 2026 · 15:12:40 UTC CVEs named by MicrosoftCVE-2026-62886, CVE-2026-69522
  3. 19 Oct 2026 · 15:12:40 UTC Related KBs
  4. 19 Oct 2026 · 15:12:40 UTC Applies toMicrosoft .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 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 Server 2025 → Windows 11, version 24H2; Windows 11, version 25H2; Windows Server 2025
  5. 19 Oct 2026 · 15:12:40 UTC Source coverage: windows-known-issuesCurrent → Not collected
  6. 19 Oct 2026 · 15:12:40 UTC Source coverage: dotnet-framework-updatesIncomplete
  7. 19 Oct 2026 · 15:12:40 UTC Link: Support articlehttps://support.microsoft.com/help/5126052 → https://support.microsoft.com/en-us/servicing/dotnetframework/windows-11/25h2/september-8-2026-kb5126052-cumulative-update-for-net-framework-3-5-and-4-8-1-for-windows-11-version
  8. 19 Oct 2026 · 15:12:40 UTC SourceMicrosoft release information, MSRC and Windows release health → Microsoft Learn and Support
  9. 19 Oct 2026 · 15:12:40 UTC KindWindows update → .NET Framework update
  10. 19 Oct 2026 · 15:12:40 UTC SummarySecurity update fixing 2 collected CVEs. → September 8, 2026-KB5126052 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2, Windows 11, version 25H2 and Microsoft server operating system 24H2
  11. 14 Oct 2026 · 11:22:42 UTC Missing security releaseUnknown: security evidence is incomplete or retained → None identified in collected security coverage
  12. 14 Oct 2026 · 11:22:42 UTC Source coverage: msrc-cvrfIncomplete → Current
ChangeIntel

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Sources read 11 Nov 15:16 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current

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