KB5089899

KB5089899 - Description of the security update for SQL Server 2025 CU4: May 12, 2026

Release Date:

5/12/2026

Version:

17.0.4040.1

Applies To

SQL Server 2025 on Windows (all editions), SQL Server 2025 on Linux (all editions)

• Summary

• Improvements and fixes included in this update

• How to obtain and install the update

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

• More information

• File information

• Information about protection and security

Summary

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

• CVE-2026-40370 - SQL Server Remote Code Execution Vulnerability

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

• SQL Server - product version: 17.0.4040.1, file version: 2025.170.4040.1

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 | | --- | --- | --- | --- | --- | | 5178546 | This fix addresses an XML external entity (XXE) vulnerability in the Web Service Task that allows an attacker to read arbitrary files from the local file system or cause a...