KB5090408: addresses an XML external entity (XXE) vulnerability in the Web Service Task

KB5090408 - Description of the security update for SQL Server 2019 GDR: May 12, 2026

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: 15.0.2170.1, file version: 2019.150.2170.1

Improvements and fixes included in this update
A downloadable Microsoft Excel workbook that contains a summary list of builds, together with their current support lifecycle, is available.

Bug Fixes:

• 5131013: 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 denial-of-service (DoS) attack.