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SQL Server 2025 CU4 + GDR SQL Server 2025 CU4 + GDR Security update
Patch Tuesday

KB5089899

KB5089899: Security update for SQL Server 2025, CU branch, May 2026. Web Service Task security flaw addressed; MSDASQL queries can fail

In short

Addresses a security flaw in the Web Service Task, but linked-server queries using MSDASQL and a provider string can fail with error 7416.

Does it affect you? Applies to: SQL Server 2025 on Windows and Linux, all editions. The update is optional for computers that do not host Microsoft SQL Server Reporting Services.

Build
17.0.4040.1
Servicing branch
CU
Security
1 fixed
Restart
Required

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

What changes

Fix 1 change

Integration Services

  • A security fix addresses an XML issue in the Web Service Task that could let an attacker read local files or cause a denial-of-service attack.1
    Addresses an XML external entity (XXE) vulnerability in the Integration Services Web Service Task.

Known issues

  1. Open Affects: Organizations and IT administrators

    Linked server queries that use MSDASQL fail with error 7416

    Linked-server queries using the MSDASQL provider and specifying a provider string can fail with error 7416, even if earlier builds allowed the connection.2

    Workaround status No workaround yet

    Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

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
CU
Restart
Required
Replaces
KB5081495, KB5083245, KB5077896, KB5077466
+2 earlier KB5075211, KB5078298
Replaced by
KB5101346
VersionBuildChannel
2025 17.0.4040.1 General availability

Security

1 vulnerability fixed
1 important
VulnerabilitySeverityCVSS
CVE-2026-40370
SQL Server Remote Code Execution Vulnerability
 Important 8.8

Downloads (Microsoft Update Catalog)

Package 2025
401.1 MB
sqlserver2025-kb5089899-x64.exe Main update · KB5089899 SHA-1: bf9581ea…f2cbb8

Updated components

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

Top changed componentsFiles
SQL Server Engine112
SQL Server PolyBase3

Sources

Updated
Cited passages from Microsoft's official notes (2)
  1. 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. 2. 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. support.microsoft.com
Checked automatically: 8 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: 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