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SQL Server 2017 GDR SQL Server 2017 GDR Security update
Patch Tuesday

KB5102338

KB5102338: Security update for SQL Server 2017, GDR branch, July 2026. Critical remote-code flaw; MSDASQL linked-server queries can fail

In short

Fixes four vulnerabilities, including a critical SQL Server remote-code execution flaw. Linked-server queries using MSDASQL with a provider string might fail with error 7416.

Does it affect you? Applies to: Supported x64 systems running SQL Server 2017, including installations on the GDR branch.

Build
14.0.2120.1
Servicing branch
GDR
Security
4 fixed · 1 critical
Restart
Required
Review notes Additional details from the official release notes (1) Read note
  • This page Linked-server queries that use MSDASQL and specify a provider string fail with 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

Fixes 4 changes

Integration Services

  • MessageQueueTask blocks remote code execution from an untrusted Microsoft Message Queuing message by restricting unsafe deserialization.1
    Restricts SoapFormatter deserialization with an allow list binder.

Query Execution

  • Fixes a memory leak that can occur when the input buffer is queried.2
    The leak occurs when using the sys.dm_exec_input_buffer dynamic management function or the DBCC INPUTBUFFER command.

Replication

  • Input passed to an internal replication procedure is validated and sanitized before the procedure uses it.3
    Addresses validation and sanitization of user input passed to an internal replication stored procedure.

SQL Agent

  • Fixes a SQL injection vulnerability that could let an authenticated attacker elevate privileges over a network.4
    Resolves improper neutralization of special elements in SQL Server commands.

Known issues

  1. 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) might fail with error 7416: access to the remote server is denied because no login-mapping exists.5

    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
2026-07-14
Classification
Security Updates
Type
Cumulative update
Servicing branch
GDR
Restart
Required
Replaces
KB5090347, KB5084819, KB5077472, KB5068403
+7 earlier KB5065224, KB5063760, KB5058716, KB5046857, KB5046058, KB5042217, KB5040942
Replaced by
KB5122775
VersionBuildChannel
2017 14.0.2120.1 General availability

Security

4 vulnerabilities fixed
1 critical 3 important
VulnerabilitySeverityCVSS
CVE-2026-54118
Microsoft SQL Server Remote Code Execution Vulnerability
 Critical 9.8
CVE-2026-47295
Microsoft SQL Server Elevation of Privilege Vulnerability
 Important 8.8
CVE-2026-55002
Microsoft SQL Server Elevation of Privilege Vulnerability
 Important 8.8
CVE-2026-47296
Microsoft SQL Server Elevation of Privilege Vulnerability
 Important 7.5

Downloads (Microsoft Update Catalog)

Package 2017
452.5 MB
sqlserver2017-kb5102338-x64.exe Main update · KB5102338 SHA-1: e5fe7b40…a067dd

Updated components

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

Top changed componentsFiles
SQL Server Engine91

Sources

Updated
Cited passages from Microsoft's official notes (5)
  1. 1. This fix resolves an insecure deserialization vulnerability in MessageQueueTask by restricting SoapFormatter deserialization that uses an allow list binder. support.microsoft.com
  2. 2. This fix resolves a memory leak that occurs if the sys.dm_exec_input_buffer dynamic management function (DMF) or the DBCC INPUTBUFFER command is used. support.microsoft.com
  3. 3. This fix addresses input validation and sanitization of user input for a parameter that's passed to an internal replication stored procedure by validating and sanitizing the input before the stored procedure uses it. support.microsoft.com
  4. 4. This fix resolves an SQL injection vulnerability in SQL Server in which improper neutralization of special elements in SQL Server commands allows an authenticated attacker to elevate privileges over a network. support.microsoft.com
  5. 5. 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, 5 quoted passages · compared with Microsoft's page on Oct 16, 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 3/5, completeness 4/5. 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