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@@ -16,7 +16,7 @@ This article lists the Microsoft SQL Server 2022 builds that were released after
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| Cumulative update name | SQL Server build version | SQL Server (sqlservr.exe) file version | Analysis Services build version | Analysis Services (msmdsrv.exe) file version | Knowledge Base number | Release date |
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 29, 2026
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_Version:_ 16.0.4236.2
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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**
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- SQL Server - Product version: **16.0.4236.2**, file version: **2022.160.4236.2**
> The initial release of this cumulative update (KB5074819), released on January 15, 2026, contained an issue that caused Database Mail to stop working. You might also see the following error message:
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>
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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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>
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> This issue affects SQL Server product version **16.0.4235.2** and file version **2022.160.4235.2**.
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>
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> This issue is resolved in the current version of this cumulative update (KB5078297).
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>
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> If you downloaded the initial release of this update, don't install it. Download and install the current version instead.
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>
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> If you already installed the initial release, [uninstall](/sql/sql-server/install/uninstall-a-cumulative-update-from-sql-server) it or install the current version to restore Database Mail functionality.
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>
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> Future cumulative updates also contain the fix for this issue. You can install them regardless of which version of this cumulative update is currently installed.
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> Email messages queued through Database Mail while the initial release was installed aren't automatically resent when you uninstall it or install a cumulative update that contains the fix.
| <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/a6ad69f8-3a68-4b3e-95a6-e56ef2be6ebb/KB5078297.csv).
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## SQL Server 2025 Cumulative Update (CU) builds
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| Cumulative update name | SQL Server build version | SQL Server (sqlservr.exe) file version | Analysis Services build version | Analysis Services (msmdsrv.exe) file version | Knowledge Base number | Release date |
| Cumulative update name | SQL Server build version | SQL Server (sqlservr.exe) file version | Analysis Services build version | Analysis Services (msmdsrv.exe) file version | Knowledge Base number | Release date|
| GDR name | SQL Server build version | SQL Server (sqlservr.exe) file version | Analysis Services build version | Analysis Services (msmdsrv.exe) file version | Knowledge Base number | Release date |
| GDR name | SQL Server build version | SQL Server (sqlservr.exe) file version | Analysis Services build version | Analysis Services (msmdsrv.exe) file version | Knowledge Base number | Release date|
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 29, 2026
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_Version:_ 17.0.4006.2
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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**
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- SQL Server - Product version: **17.0.4006.2**, file version: **2025.170.4006.2**
> The initial release of this cumulative update (KB5074901), released on January 15, 2026, contained an issue that caused Database Mail to stop working. You might also see the following error message:
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>
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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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> This issue affects SQL Server product version **17.0.4005.7** and file version **2025.170.4005.7**.
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>
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> This issue is resolved in the current version of this cumulative update (KB5078298).
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>
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> If you downloaded the initial release of this update, don't install it. Download and install the current version instead.
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> If you already installed the initial release, [uninstall](/sql/sql-server/install/uninstall-a-cumulative-update-from-sql-server) it or install the current version to restore Database Mail functionality.
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>
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> Future cumulative updates also contain the fix for this issue. You can install them regardless of which version of this cumulative update is currently installed.
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> Email messages queued through Database Mail while the initial release was installed aren't automatically resent when you uninstall it or install a cumulative update that contains the fix.
### Incorrect behavior of SESSION_CONTEXT in parallel plans
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The following update is available from the Microsoft Download Center:
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:::image type="icon" source="../media/download-icon.png" border="false"::: [Download the latest cumulative update package for SQL Server 2025 now](https://www.microsoft.com/en-us/download/details.aspx?id=108529)
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:::image type="icon" source="../media/download-icon.png" border="false"::: [Download the latest cumulative update package for SQL Server 2025 now](https://www.microsoft.com/download/details.aspx?id=108540)
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> [!NOTE]
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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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@@ -108,20 +118,20 @@ For installation instructions and direct links to the CU package downloads, see
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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/e938d686-2fcb-45bf-9105-08e2c0d50880/KB5078298.csv).
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