Title Products Classification Last Updated Version Size          Download
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Microsoft server operating system version 21H2 for x64 (KB5126422) Microsoft Server operating system-21H2 Security Updates 9/8/2026 n/a 76.2 MB 79944499
2026-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H2 for x64 (KB5126145) Windows 10 LTSB Security Updates 9/8/2026 n/a 155.5 MB 163090294
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 for arm64 (KB5126052) Windows 11 Security Updates 9/8/2026 n/a 110.6 MB 115959073
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Microsoft server operating system version 24H2 for arm64 (KB5126052) Microsoft Server Operating System-24H2 Security Updates 9/8/2026 n/a 110.6 MB 115959073
2026-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Microsoft server operating system version 21H2 for x64 (KB5126149) Microsoft Server operating system-21H2 Security Updates 9/8/2026 n/a 152.5 MB 159920972
2026-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 21H2 (KB5126145) Windows 10 LTSB Security Updates 9/8/2026 n/a 98.4 MB 103191877
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H2 for x64 (KB5126421) Windows 10 LTSB Security Updates 9/8/2026 n/a 77.5 MB 81247370
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 26H2 for arm64 (KB5126052) Windows Insider Pre-Release Security Updates 9/8/2026 n/a 110.6 MB 115959073
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 for arm64 (KB5126052) Windows 11 Security Updates 9/8/2026 n/a 110.6 MB 115959073
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Microsoft server operating system version 24H2 for x64 (KB5126052) Microsoft Server Operating System-24H2 Security Updates 9/8/2026 n/a 92.3 MB 96738688
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 for x64 (KB5126052) Windows 11 Security Updates 9/8/2026 n/a 92.3 MB 96738688
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 26H1 for x64 (KB5126053) Windows Insider Pre-Release Security Updates 9/8/2026 n/a 44.4 MB 46545779
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 23H2 for arm64 (KB5126424) Windows 11 Security Updates 9/8/2026 n/a 93.1 MB 97626886
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 26H1 for arm64 (KB5126053) Windows 11 Security Updates 9/8/2026 n/a 58.5 MB 61298640
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 for x64 (KB5126052) Windows 11 Security Updates 9/8/2026 n/a 92.3 MB 96738688
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 22H2 (KB5126421) Windows 10, version 1903 and later Security Updates 9/8/2026 n/a 48.9 MB 51283326
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 22H2 for x64 (KB5126421) Windows 10, version 1903 and later Security Updates 9/8/2026 n/a 77.5 MB 81247370
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 23H2 for x64 (KB5126424) Windows 11 Security Updates 9/8/2026 n/a 76.2 MB 79879119
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 26H2 for x64 (KB5126052) Windows Insider Pre-Release Security Updates 9/8/2026 n/a 92.3 MB 96738688
2026-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 22H2 (KB5126146) Windows 10, version 1903 and later Security Updates 9/8/2026 n/a 98.4 MB 103191877
2026-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 10 Version 21H2 (KB5126421) Windows 10 LTSB Security Updates 9/8/2026 n/a 48.9 MB 51283326
2026-09 Cumulative Update for .NET Framework 3.5, 4.8 and 4.8.1 for Windows 10 Version 22H2 for x64 (KB5126146) Windows 10, version 1903 and later Security Updates 9/8/2026 n/a 155.5 MB 163090294
2026-08 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 26H1 for arm64 (KB5122386) Windows 11 Updates 8/27/2026 n/a 57.2 MB 60007645
2026-08 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 25H2 for arm64 (KB5122385) Windows 11 Updates 8/27/2026 n/a 110.6 MB 115980179
2026-08 Cumulative Update Preview for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 for arm64 (KB5122385) Windows 11 Updates 8/27/2026 n/a 110.6 MB 115980179
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