Windows 11, version 26H1 known issues
Microsoft lists 1 open issue for Windows 11, version 26H1. Below is every issue Microsoft has listed for this version, with the update that caused it and when it was resolved.
| Issue | Status | Caused by | Opened | Resolved or updated |
|---|---|---|---|---|
| SQL Server linked server connections might remain open | Confirmed | OS Build 28000.3231, KB5127646, 2026-10-13 | 11 November 2026 | 11 November 2026 |
| USB audio devices might fail to start or produce no sound | Resolved KB5132059 | OS Build 28000.2954, KB5124012, 2026-09-08 | 10 November 2026 | 10 November 2026 |
| Devices might experience a black screen or desktop loading issues after sign-in | Resolved KB5127646 | OS Build 28000.2804, KB5120996, 2026-08-27 | 13 October 2026 | 13 October 2026 |
| Remote Desktop connections might fail for non-admin users with error 0xC000000D | Resolved KB5127653 | OS Build 28000.3086, KB5124006, 2026-09-22 | 13 October 2026 | 28 October 2026 |
| Domain-joined devices might lose their secure trust relationship with the domain | Resolved KB5124006 | OS Build 28000.2954, KB5124012, 2026-09-08 | 16 September 2026 | 22 September 2026 |
| Remote Desktop Services might stop responding after Sept. 2026 security update | Resolved KB5129194 | OS Build 28000.2954, KB5124012, 2026-09-08 | 11 September 2026 | 14 September 2026 |
| Host folder shares might be unavailable in Hyper-V-based Linux VMs | Resolved KB5129194 | OS Build 28000.2954, KB5124012, 2026-09-08 | 11 September 2026 | 14 September 2026 |
| Microsoft Teams and Outlook might fail to launch on ARM-based devices | Resolved KB5124012 | OS Build 28000.2704, KB5121000, 2026-08-11 | 2 September 2026 | 8 September 2026 |
| Incorrect notifications that "Microsoft Defender Antivirus is turned off" | Resolved | N/A | 28 August 2026 | 30 September 2026 |
| Windows Server Update Services sync operations might have issues or time out | Resolved | N/A | 18 July 2026 | 20 July 2026 |
| GIF functionality in the Windows Emoji Panel might become unavailable | Resolved KB5095091 | N/A | 30 June 2026 | 23 June 2026 |
| Deleting a file from the Recycle Bin displays an internal filename in the dialog | Resolved KB5095091 | OS Build 28000.2269, KB5095051, 2026-06-09 | 18 June 2026 | 23 June 2026 |
Source: Microsoft's release health page for Windows 11, version 26H1. Dates are in UTC.
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