KB5128494 - Description of the security update for SQL Server 2019 CU32: October 13, 2026

Applies To
SQL Server 2019 on Windows SQL Server 2019 on Linux

Release date: October 13, 2026

Version: 15.0.4500.2

Summary

This security update contains fixes and resolves vulnerabilities. To learn more about the vulnerabilities, see the following security advisories:

The Microsoft SQL Server components are updated to the following builds in this security update:

  • SQL Server - product version: 15.0.4500.2, file version: 2019.150.4500.2

Important

To help secure SQL Server on Windows, enable encryption with Extended Protection.

Known issues in this update

Linked server queries that use MSDASQL fail with error 7416

Linked server queries that use the MSDASQL (OLE DB Provider for ODBC Drivers) provider and specify a provider string (@provstr) fail and return the following error message:

Msg 7416, Level 16
Access to the remote server is denied because no login-mapping exists.

A stricter connection validation check in the Database Engine can reject connections for certain linked server configurations that use the MSDASQL provider, even if earlier builds allowed those connections.

For more information and workarounds, see Linked server queries that use MSDASQL fail with error 7416.

Improvements and fixes included in this update

A downloadable Excel workbook that contains a summary list of builds, together with their current support lifecycle, is available. The Excel file also contains detailed fix lists. Download this Excel file now.

Note

Individual entries in the following table can be referenced directly through a bookmark. If you select any bug reference ID in the table, a bookmark tag is added to the URL by using the "#bkmk_NNNNNNN" format. You can then share this URL with others so that they can jump directly to the desired fix in the table.

Bug reference Description Fix area Component Platform
5419476 Resolves a security vulnerability in PolyBase by improving validation during data processing. SQL Server Engine PolyBase Linux, Windows
5505576 Updates the third-party archive-extraction component that SQL Server uses if external language and external library packages are installed. After the update is applied, package extraction uses the refreshed component. SQL Server Engine Extensibility Linux, Windows
5521448 Fixes multiple memory-corruption and memory-disclosure vulnerabilities in the SQL Server SQL Satellite protocol message parsing logic that's used by Machine Learning Services and Language Extensions. SQL Server Engine Extensibility Linux, Windows
5523877 Adds validation of FILESTREAM fragment size on Availability Group secondary replicas to reject oversized fragments. SQL Server Engine High Availability and Disaster Recovery Linux, Windows
5533859 Improves security and reliability for Queued Updating Subscriptions in Transactional Replication. SQL Server Engine Replication Windows
5533866 Improves security and reliability for Queued Updating Subscriptions in Transactional Replication. SQL Server Engine Replication Windows
5542026 Addresses an input-validation issue in SQL Server Virtual Device Interface (VDI) and SQL Writer backup paths in which malformed size values potentially cause out-of-bounds memory access. Introduces hardened arithmetic and transfer-sized validation to reject invalid requests before unsafe memory handling occurs. SQL Server Engine Backup Restore Windows
5542085 Improves Showplan input handling to enhance security and reliability. SQL Server Engine Query Store Windows
5544848 Addresses an integer handling issue in SQL Server backup and restore metadata processing that potentially allows a local authenticated user to gain elevated privileges and cause a service to stop responding. Adds strict bounds validation and safe size calculation checks to reject malformed or oversized inputs before memory operations occur. SQL Server Engine Backup Restore Windows
5558727 Updates shared memory handling. SQL Server Engine PolyBase Linux, Windows
5570323 Updates Native Compare Strings. SQL Server Engine PolyBase Windows
5571553 Fixes a security vulnerability in the SQL Server Virtual Device Interface (VDI) in which an out-of-bounds write action potentially occurs while opening a virtual device set. SQL Server Engine Backup Restore Linux, Windows
5572071 Fixes a security vulnerability in the SQL Server Virtual Device Interface (VDI) in which an out-of-bounds read or write action potentially occurs while processing transferred data during backup or restore operations. SQL Server Engine Backup Restore Linux, Windows
5573960 Fixes unsafe deserialization of PolyBase rollback queue data so that malformed payloads are rejected. SQL Server Engine PolyBase Linux, Windows
5582061 Fixes an issue in which MSDASQL linked server connections fail if the provider string doesn't include a user ID (UID). SQL Server Engine Distributed Query Linux, Windows
5639360 Fixes an issue in replication operations that affects data validation. SQL Server Engine Replication Linux, Windows
5639370 Fixes an issue in merge replication Web Synchronization operations that affects data validation. SQL Server Engine Replication Linux, Windows
5639387 Strengthens authorization checks for certain replication-related database operations to help prevent unintended disclosure of database information. SQL Server Engine Replication Linux, Windows
5639444 Limits LoginSid processing within the SQL Trace reader to the internal buffer size to prevent malformed trace data from causing an out-of-bounds read action. SQL Server Engine Programmability Linux, Windows
5644551 Improves security and reliability in replication security metadata handling during Subscriber database restore and upgrade operations. SQL Server Engine Replication Windows
5645002 Improves security and reliability for the Log Reader Agent in a heterogeneous transactional replication scenario. SQL Server Engine Replication Windows
5650546 Fixes several security vulnerabilities that allow information disclosure or a denial of service when the Database Engine reads a specially crafted Extended Events (.xel) file. SQL Server Engine Extended Events Linux, Windows

How to obtain and install the update

Method 1: Windows Update

This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the standalone package for this update, go to the Microsoft Update Catalog website.

Note

  • The detection logic has been updated for this and future security releases that are posted to the Microsoft Update Catalog website. For more information, see Updates to the Microsoft Update detection logic for SQL Server servicing.
  • This update is made available through the Microsoft Update Catalog for all servers that are running SQL Server, even if Reporting Services is not installed. Installing this security update is optional for computers that do not host Microsoft SQL Server Reporting Services.

Method 3: Microsoft Download Center

The following file is available for download from the Microsoft Download Center:

Download icon Download the package now

How to obtain or download the latest cumulative update package for Linux

To update SQL Server 2019 on Linux to the latest CU, you must first have the Cumulative Update repository configured. Then, update your SQL Server packages by using the appropriate platform-specific update command.

For installation instructions and direct links to the CU package downloads, see the SQL Server 2019 Release Notes.

More information

Prerequisites

To apply this update, you must have SQL Server 2019 or any SQL Server 2019 CU release through this SQL Server 2019 CU32 GDR installed.

Security update deployment information

For deployment information about this update, see Deployments - Security Update Guide.

File hash information

File name SHA256 hash
SQLServer2019-KB5128494-x64.exe 3C85C6D982D06EDC70E312934CCD3413386000359E180BFD63901F4256C44E04

File information

The English version of this package has the file attributes (or later file attributes) that are listed in the following worksheet. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it's converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

For all supported x64-based versions - Download the list of files that are included in security update 5128494.

Information about protection and security

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Learn how we guard against cyber threats: Microsoft Security