KB5089271: Security update for SQL Server 2016, GDR branch, May 2026. Web Service Task XML vulnerability addressed; linked queries fail

The update addresses an XML external entity vulnerability in the Web Service Task. Linked server queries using MSDASQL can still fail with error 7416; Microsoft links to troubleshooting information and workarounds.

Does it affect you? Applies to: SQL Server 2016 SP3 GDR on supported x64-based systems.

Review notes Additional details from the official release notes (2) Read notes

This page The reported failures affect linked server queries that use MSDASQL and specify a provider string; they return error 7416.
In short The reported failures affect linked server queries that use MSDASQL and specify a provider string; they return error 7416.

The official sources are linked at the end of the page.

For servers on the GDR branch: they get security fixes only. Servers that install cumulative updates (CU branch) get a separate update. Which branch am I on?

What changes

Fix 1 change

Integration Services

The Web Service Task's XML handling is addressed for a vulnerability that could let an attacker read local files or cause a denial of service.¹
Addresses an XML external entity (XXE) vulnerability in the Web Service Task.

Known issues

Open Affects: Organizations and IT administrators

Linked server queries that use MSDASQL fail with error 7416

Linked server queries that use the MSDASQL provider and specify a provider string (@provstr) can fail with error 7416. A stricter Database Engine connection check can reject some configurations that worked in earlier builds.²

How to apply the workaround Workaround

Consult the linked Microsoft troubleshooting article for workarounds.²

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released: 2026-05-12
Classification: Security Updates
Type: Cumulative update
Servicing branch: GDR
Restart: Required
Replaces: KB5084821, KB5077474, KB5068401, KB5065226

+6 earlier
KB5063762, KB5058718, KB5046855, KB5046063, KB5042207, KB5040946
Replaced by: KB5102340

Version	Build	Channel
2016	13.0.6490.1	General availability

Security

1 vulnerability fixed

1 important

Vulnerability	Severity	CVSS
CVE-2026-40370 SQL Server Remote Code Execution Vulnerability	Important	8.8

Downloads (Microsoft Update Catalog)

Package 2016

511.3 MB

sqlserver2016-kb5089271-x64.exe Main update · KB5089271 SHA-1: 3cc025f6…1093c3

Updated components

527 files changed since the previous update for the same versions.

Top changed components	Files
SQL Server Engine	77
SQL Server Analysis Services	3

Sources

Microsoft Support: KB5089271

Updated Oct 26, 2026

Cited passages from Microsoft's official notes (2)

1. 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. support.microsoft.com
2. 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 support.microsoft.com

Checked automatically: 7 of 8 checks passed, 2 quoted passages · compared with Microsoft's page on Sep 26, 2026

Quotes found in the official pages: passed
Numbers found in the sources: passed
Vulnerabilities from the dossier only: passed
Links to allowed domains only: passed
Every official change covered: passed
Readable plain text: passed
Changes confirmed by the file list: passed
Sources agree: not passed

A second AI read the text against the sources: correctness 4/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake