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SQL Server 2019 CU32 + GDR SQL Server 2019 CU32 + GDR Security update
Patch Tuesday

KB5090407

KB5090407: Security update for SQL Server 2019, CU branch, May 2026. Web Service Task flaw addressed; linked-server error 7416 remains

In short

The update addresses a Web Service Task vulnerability that could let an attacker read arbitrary local files or cause a denial-of-service attack. Linked-server queries using MSDASQL can still fail with error 7416.

Does it affect you? Applies to: Supported x64 systems running SQL Server 2019, with SQL Server 2019 or a CU release through CU32 GDR installed. Installation is optional on computers that do not host SQL Server Reporting Services.

Build
15.0.4470.1
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

  • The Web Service Task vulnerability is addressed. It could let an attacker read arbitrary files from the local file system or cause a denial-of-service attack.1
    Bug reference 5131009 addresses an XML external entity (XXE) vulnerability in the 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, stating that no login mapping exists. Stricter Database Engine connection validation can reject some configurations even if earlier builds allowed them.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
KB5084816, KB5077469, KB5068404, KB5065222
+15 earlier KB5063757, KB5058722, KB5054833, KB5049296, KB5049235, KB5046860, KB5046365, KB5046060, KB5042749, KB5039747, KB5040948, KB5037331, KB5035123, KB5036335, KB5033688
Replaced by
KB5102335
VersionBuildChannel
2019 15.0.4470.1 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 2019
888.6 MB
sqlserver2019-kb5090407-x64.exe Main update · KB5090407 SHA-1: a6f4ffa7…097ea6

Updated components

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

Top changed componentsFiles
SQL Server Engine119
SQL Server PolyBase4

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. 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: 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 5/5, clarity 5/5, 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