Safe OS Dynamic Updates
Recovery environment updates, tracked separately from Windows cumulative and Setup Dynamic Updates.
SafeOS updates service the Windows recovery environment (WinRE) used during recovery and feature updates. They can include security fixes and reliability improvements. A catalog classification of Critical Updates is not a CVE severity rating.
Installation channels, prerequisites, replacement information and the need to update installation media vary by KB. Always check the Microsoft deployment guidance and the relevant support article. This listing does not assess whether a device's WinRE is patched.
Package history
714 packages · 262 KB articles · Last successful refresh: . Automatic discovery every 6 hours. Microsoft Update Catalog source
714 matching packages. Each row is a catalog package; the same KB can apply to multiple versions and architectures.
Release date and package build come from the KB article when available. Catalog revised is Microsoft's catalog revision date, not the original release date. Missing article details are explicitly marked and retried automatically.
| Product / version | Architecture | KB / details | Release date | Catalog revised | Package build | Catalog |
|---|---|---|---|---|---|---|
| Microsoft server operating system 23H2 | x64 |
KB5087584
Details2026-05 Safe OS Dynamic Update for Microsoft server operating system version 23H2 for x64-based Systems (KB5087584) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 17.0 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Microsoft server operating system 24H2 | x64 |
KB5087588
Details2026-05 Safe OS Dynamic Update for Microsoft server operating system version 24H2 for x64-based Systems (KB5087588) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 122.9 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 10 1607 | x64 |
KB5087590
Details2026-05 Dynamic Update for Windows 10 Version 1607 for x64-based Systems (KB5087590) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 148.5 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 10 1607 | x86 |
KB5087590
Details2026-05 Dynamic Update for Windows 10 Version 1607 for x86-based Systems (KB5087590) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 129.4 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 10 1809 | x64 |
KB5087592
Details2026-05 Dynamic Update for Windows 10 Version 1809 for x64-based Systems (KB5087592) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 125.8 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 10 1809 | x86 |
KB5087592
Details2026-05 Dynamic Update for Windows 10 Version 1809 for x86-based Systems (KB5087592) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 107.3 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 10 21H2 | arm64 |
KB5087593
Details2026-05 Dynamic Update for Windows 10 Version 21H2 for ARM64-based Systems (KB5087593) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 154.8 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 10 21H2 | x64 |
KB5087593
Details2026-05 Dynamic Update for Windows 10 Version 21H2 for x64-based Systems (KB5087593) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 124.7 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 10 21H2 | x86 |
KB5087593
Details2026-05 Dynamic Update for Windows 10 Version 21H2 for x86-based Systems (KB5087593) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 106.7 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 11 23H2 | arm64 |
KB5087594
Details2026-05 Safe OS Dynamic Update for Windows 11, version 23H2 for arm64-based Systems (KB5087594) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 157.4 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 11 23H2 | x64 |
KB5087594
Details2026-05 Safe OS Dynamic Update for Windows 11, version 23H2 for x64-based Systems (KB5087594) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 135.1 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Microsoft server operating system 21H2 | x64 |
KB5087595
Details2026-05 Dynamic Update for Microsoft server operating system version 21H2 for x64-based Systems (KB5087595) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 120.6 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 11 26H1 | arm64 |
KB5089591
Details2026-05 Safe OS Dynamic Update for Windows 11, version 26H1 for arm64-based Systems (KB5089591) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 110.6 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 11 26H1 | x64 |
KB5089591
Details2026-05 Safe OS Dynamic Update for Windows 11, version 26H1 for x64-based Systems (KB5089591) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 97.5 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 11 24H2 | arm64 |
KB5089593
Details2026-05 Safe OS Dynamic Update for Windows 11, version 24H2 for arm64-based Systems (KB5089593) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 153.3 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 11 24H2 | x64 |
KB5089593
Details2026-05 Safe OS Dynamic Update for Windows 11, version 24H2 for x64-based Systems (KB5089593) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 131.2 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 11 25H2 | arm64 |
KB5089593
Details2026-05 Safe OS Dynamic Update for Windows 11, version 25H2 for arm64-based Systems (KB5089593) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 153.3 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 11 25H2 | x64 |
KB5089593
Details2026-05 Safe OS Dynamic Update for Windows 11, version 25H2 for x64-based Systems (KB5089593) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 131.2 MB. |
2026-05-12 | 2026-05-12 | Not available |
Package / download |
| Windows 11 26H1 | arm64 |
KB5083991
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 26H1 for arm64-based Systems (KB5083991) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 109.3 MB. |
2026-04-30 | 2026-04-30 | Not available |
Package / download |
| Windows 11 26H1 | x64 |
KB5083991
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 26H1 for x64-based Systems (KB5083991) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 96.1 MB. |
2026-04-30 | 2026-04-30 | Not available |
Package / download |
| Windows 11 24H2 | arm64 |
KB5084812
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 24H2 for arm64-based Systems (KB5084812) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 145.8 MB. |
2026-04-30 | 2026-04-30 | Not available |
Package / download |
| Windows 11 24H2 | x64 |
KB5084812
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 24H2 for x64-based Systems (KB5084812) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 123.5 MB. |
2026-04-30 | 2026-04-30 | Not available |
Package / download |
| Windows 11 25H2 | arm64 |
KB5084812
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 25H2 for arm64-based Systems (KB5084812) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 145.8 MB. |
2026-04-30 | 2026-04-30 | Not available |
Package / download |
| Windows 11 25H2 | x64 |
KB5084812
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 25H2 for x64-based Systems (KB5084812) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 123.5 MB. |
2026-04-30 | 2026-04-30 | Not available |
Package / download |
| Microsoft server operating system 23H2 | x64 |
KB5082235
Details2026-04 Safe OS Dynamic Update for Microsoft server operating system version 23H2 for x64-based Systems (KB5082235) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 16.7 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Microsoft server operating system 24H2 | x64 |
KB5082237
Details2026-04 Safe OS Dynamic Update for Microsoft server operating system version 24H2 for x64-based Systems (KB5082237) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 117.0 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 10 1607 | x64 |
KB5082239
Details2026-04 Dynamic Update for Windows 10 Version 1607 for x64-based Systems (KB5082239) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 141.3 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 10 1607 | x86 |
KB5082239
Details2026-04 Dynamic Update for Windows 10 Version 1607 for x86-based Systems (KB5082239) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 122.0 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 10 1809 | x64 |
KB5082240
Details2026-04 Dynamic Update for Windows 10 Version 1809 for x64-based Systems (KB5082240) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 118.9 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 10 1809 | x86 |
KB5082240
Details2026-04 Dynamic Update for Windows 10 Version 1809 for x86-based Systems (KB5082240) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 100.9 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 10 21H2 | arm64 |
KB5082241
Details2026-04 Dynamic Update for Windows 10 Version 21H2 for ARM64-based Systems (KB5082241) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 147.1 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 10 21H2 | x64 |
KB5082241
Details2026-04 Dynamic Update for Windows 10 Version 21H2 for x64-based Systems (KB5082241) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 117.2 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 10 21H2 | x86 |
KB5082241
Details2026-04 Dynamic Update for Windows 10 Version 21H2 for x86-based Systems (KB5082241) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 100.9 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 11 23H2 | arm64 |
KB5082242
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 23H2 for arm64-based Systems (KB5082242) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 150.3 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 11 23H2 | x64 |
KB5082242
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 23H2 for x64-based Systems (KB5082242) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 130.3 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Microsoft server operating system 21H2 | x64 |
KB5082243
Details2026-04 Dynamic Update for Microsoft server operating system version 21H2 for x64-based Systems (KB5082243) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 114.5 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 11 26H1 | arm64 |
KB5083817
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 26H1 for arm64-based Systems (KB5083817) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 105.3 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 11 26H1 | x64 |
KB5083817
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 26H1 for x64-based Systems (KB5083817) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 92.8 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 11 24H2 | arm64 |
KB5083826
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 24H2 for arm64-based Systems (KB5083826) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 143.2 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 11 24H2 | x64 |
KB5083826
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 24H2 for x64-based Systems (KB5083826) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 120.4 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 11 25H2 | arm64 |
KB5083826
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 25H2 for arm64-based Systems (KB5083826) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 143.2 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 11 25H2 | x64 |
KB5083826
Details2026-04 Safe OS Dynamic Update for Windows 11 Version 25H2 for x64-based Systems (KB5083826) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 120.4 MB. |
2026-04-14 | 2026-04-14 | Not available |
Package / download |
| Windows 11 26H1 | arm64 |
KB5081151
Details2026-03 Safe OS Dynamic Update for Windows 11 Version 26H1 for arm64-based Systems (KB5081151) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 21.7 MB. |
2026-03-26 | 2026-03-26 | Not available |
Package / download |
| Windows 11 26H1 | x64 |
KB5081151
Details2026-03 Safe OS Dynamic Update for Windows 11 Version 26H1 for x64-based Systems (KB5081151) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 11.0 MB. |
2026-03-26 | 2026-03-26 | Not available |
Package / download |
| Windows 11 24H2 | arm64 |
KB5083482
Details2026-03 Safe OS Dynamic Update for Windows 11 Version 24H2 for arm64-based Systems (KB5083482) This update makes improvements to the Windows recovery environment (WinRE). The following is a summary of the improvement that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the improvement we are documenting. Classification: Critical Updates. Size: 55.6 MB. |
2026-03-26 | 2026-03-26 | Not available |
Package / download |
| Windows 11 24H2 | x64 |
KB5083482
Details2026-03 Safe OS Dynamic Update for Windows 11 Version 24H2 for x64-based Systems (KB5083482) This update makes improvements to the Windows recovery environment (WinRE). The following is a summary of the improvement that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the improvement we are documenting. Classification: Critical Updates. Size: 36.2 MB. |
2026-03-26 | 2026-03-26 | Not available |
Package / download |
| Windows 11 25H2 | arm64 |
KB5083482
Details2026-03 Safe OS Dynamic Update for Windows 11 Version 25H2 for arm64-based Systems (KB5083482) This update makes improvements to the Windows recovery environment (WinRE). The following is a summary of the improvement that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the improvement we are documenting. Classification: Critical Updates. Size: 55.6 MB. |
2026-03-26 | 2026-03-26 | Not available |
Package / download |
| Windows 11 25H2 | x64 |
KB5083482
Details2026-03 Safe OS Dynamic Update for Windows 11 Version 25H2 for x64-based Systems (KB5083482) This update makes improvements to the Windows recovery environment (WinRE). The following is a summary of the improvement that this update addresses when you install this update. The bold text within the brackets indicates the item or area of the improvement we are documenting. Classification: Critical Updates. Size: 36.2 MB. |
2026-03-26 | 2026-03-26 | Not available |
Package / download |
| Microsoft server operating system 23H2 | x64 |
KB5078785
Details2026-03 Safe OS Dynamic Update for Microsoft server operating system version 23H2 for x64-based Systems (KB5078785) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 15.0 MB. |
2026-03-10 | 2026-03-10 | Not available |
Package / download |
| Microsoft server operating system 24H2 | x64 |
KB5078794
Details2026-03 Safe OS Dynamic Update for Microsoft server operating system version 24H2 for x64-based Systems (KB5078794) This update makes improvements to the Windows recovery environment (WinRE). Classification: Critical Updates. Size: 109.7 MB. |
2026-03-10 | 2026-03-10 | Not available |
Package / download |
Programmatic access: GET /api/WindowsVersions/safeos. See API access and authentication.