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Database Mail stops working after you install this cumulative update. You might see the following error message:
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This issue is **resolved** in the currently available version of this cumulative update.
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If the initially released version of this cumulative update is installed, Database Mail stops working. You might see the following error message:
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> Could not load file or assembly 'Microsoft.SqlServer.DatabaseMail.XEvents, Version=17.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The system cannot find the file specified.
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If you use Database Mail and already downloaded this update, don't install it until a fix is available.
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If you downloaded the initially released version of this update, don't install it. Download and install the currently available version of the update.
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If you already installed this update, [uninstall it](/sql/sql-server/install/uninstall-a-cumulative-update-from-sql-server) to restore Database Mail functionality.
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If you already installed the initially released update, install the currently available version of the update to restore Database Mail functionality.
Copy file name to clipboardExpand all lines: support/sql/releases/sqlserver-2022/cumulativeupdate23.md
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title: Cumulative Update 23 for SQL Server 2022 (KB5074819)
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description: This article contains the summary, known issues, improvements, fixes, and other information for SQL Server 2022 Cumulative Update 23 (KB5074819).
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ms.date: 01/20/2026
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title: Cumulative Update 23 for SQL Server 2022 (KB5078297)
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description: This article contains the summary, known issues, improvements, fixes, and other information for SQL Server 2022 Cumulative Update 23 (KB5078297).
# KB5074819 - Cumulative Update 23 for SQL Server 2022
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# KB5078297 - Cumulative Update 23 for SQL Server 2022
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_Release Date:_ January 15, 2026
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_Version:_ 16.0.4235.2
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_Release Date:_ January [todo], 2026
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_Version:_ 16.0.todo
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## Summary
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> [!IMPORTANT]
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> This update is temporarily unavailable for download because of a [known issue related to Database Mail](#database-mail-stops-working-after-updating).
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This article describes Cumulative Update package 23 (CU23) for Microsoft SQL Server 2022. This update contains 15 [fixes](#improvements-and-fixes-included-in-this-update) that were issued after the release of SQL Server 2022 Cumulative Update 22. It updates components in the following builds:
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- SQL Server - Product version: **16.0.4235.2**, file version: **2022.160.4235.2**
This update was initially released on January 15, 2026 as KB5074819 with SQL Server product version **16.0.4235.2** and file version **2022.160.4235.2**. The initial release of this update contained a [defect](#database-mail-stops-working-after-updating) that caused Database Mail to stop working. The defect is fixed in the currently available version of this cumulative update.
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## Known issues in this update
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### Database Mail stops working after updating
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| <aid=4676249>[4676249](#4676249)</a> | Fixes an issue in which backup log operations fail and return an error that indicates that `BACKUP LOG` is not allowed while the recovery model is `SIMPLE`. | SQL Server Engine | Backup Restore | Windows |
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| <aid=4710575>[4710575](#4710575)</a> | Fixes an AV assertion issue in `DbMgrPartner` that's related to new log readiness notifications. | SQL Server Engine | High Availability and Disaster Recovery | All |
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| <aid=4769216>[4769216](#4769216)</a> | Fixes an issue in which non-yielding scheduler dump files are generated when SSL connections are closed under high CPU load. |Conectivity| Protocols | All |
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| <aid=4769216>[4769216](#4769216)</a> | Fixes an issue in which non-yielding scheduler dump files are generated when SSL connections are closed under high CPU load. |Connectivity| Protocols | All |
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| <aid=4783675>[4783675](#4783675)</a> | Fixes an issue in which upgrading from SQL Server 2019 to SQL Server 2022 might cause the upgrade process to stop responding during the model database upgrade phase. | SQL Server Engine | Programmability | All |
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| <aid=4783748>[4783748](#4783748)</a> | Changes the behavior of the program to return error 19544 instead of returning an assert when you create an availability group that has a name that's longer than 64 characters by using `cluster_type = NONE` or `EXTERNAL`. | SQL Server Engine | High Availability and Disaster Recovery | All |
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| <aid=4796333>[4796333](#4796333)</a> | Fixes an issue that causes crashes when an invalid ID type is returned from the Domain Controller in LookupAccountSid. | SQL Server Engine | Linux | Linux |
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The following update is available from the Microsoft Update Catalog:
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- :::image type="icon" source="../media/download-icon.png" border="false"::: [Download the cumulative update package for SQL Server 2022 CU23 now](https://www.catalog.update.microsoft.com/Search.aspx?q=KB5074819)
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- :::image type="icon" source="../media/download-icon.png" border="false"::: [Download the cumulative update package for SQL Server 2022 CU23 now](https://www.catalog.update.microsoft.com/Search.aspx?q=KB5078297)
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> [!NOTE]
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<details>
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<summary><b>File hash information</b></summary>
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You can verify the download by computing the hash of the _SQLServer2022-KB5074819-x64.exe_ file through the following command:
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You can verify the download by computing the hash of the _SQLServer2022-KB5078297-x64.exe_ file through the following command:
Download [the list of files that are included in KB5074819](https://download.microsoft.com/download/6c92fcb2-4e38-40c8-8fac-179e0b8914e6/KB5074819.csv).
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Download [the list of files that are included in KB5078297](https://download.microsoft.com/download/6c92fcb2-4e38-40c8-8fac-179e0b8914e6/KB5078297.csv).
Copy file name to clipboardExpand all lines: support/sql/releases/sqlserver-2025/cumulativeupdate1.md
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title: Cumulative update 1 for SQL Server 2025 (KB5074901)
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description: This article contains the summary, known issues, improvements, fixes, and other information for SQL Server 2025 Cumulative Update 1 (KB5074901).
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ms.date: 01/20/2026
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title: Cumulative update 1 for SQL Server 2025 (KB5078298)
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description: This article contains the summary, known issues, improvements, fixes, and other information for SQL Server 2025 Cumulative Update 1 (KB5078298).
# KB5074901 - Cumulative Update 1 for SQL Server 2025
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# KB5078298 - Cumulative Update 1 for SQL Server 2025
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_Release Date:_ January 15, 2026
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_Version:_ 17.0.4005.7
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_Release Date:_ January [todo], 2026
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_Version:_ 17.0.todo
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## Summary
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> [!IMPORTANT]
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> This update is temporarily unavailable for download because of a [known issue related to Database Mail](#database-mail-stops-working-after-updating).
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This article describes Cumulative Update package 1 (CU1) for Microsoft SQL Server 2025. This update contains 16 [fixes](#improvements-and-fixes-included-in-this-update) that were issued after the initial release of SQL Server 2025. It updates components in the following builds:
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- SQL Server - Product version: **17.0.4005.7**, file version: **2025.170.4005.7**
This update was initially released on January 15, 2026 as KB5074901 with SQL Server product version **17.0.4005.7** and file version **2025.170.4005.7**. The initial release of this update contained a [defect](#database-mail-stops-working-after-updating) that caused Database Mail to stop working. The defect is fixed in the currently available version of this cumulative update.
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## Known issues in this update
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The following update is available from the Microsoft Update Catalog:
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- :::image type="icon" source="../media/download-icon.png" border="false"::: [Download the cumulative update package for SQL Server 2025 CU1 now](https://www.catalog.update.microsoft.com/Search.aspx?q=KB5074901)
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- :::image type="icon" source="../media/download-icon.png" border="false"::: [Download the cumulative update package for SQL Server 2025 CU1 now](https://www.catalog.update.microsoft.com/Search.aspx?q=KB5078298)
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> [!NOTE]
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<details>
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<summary><b>File hash information</b></summary>
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You can verify the download by computing the hash of the _SQLServer2025-KB5074901-x64.exe_ file through the following command:
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You can verify the download by computing the hash of the _SQLServer2025-KB5078298-x64.exe_ file through the following command:
Download [the list of files that are included in KB5074901](https://download.microsoft.com/download/85e8b2cf-3981-4c62-b711-a812b4057503/KB5074901.csv).
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Download [the list of files that are included in KB5078298](https://download.microsoft.com/download/85e8b2cf-3981-4c62-b711-a812b4057503/KB5078298.csv).
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