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SQL Server 2017 CU31 + GDR SQL Server 2017 CU31 + GDR Security update
Patch Tuesday

KB5102337

KB5102337: Security update for SQL Server 2017, CU branch, July 2026. Critical remote-code-execution flaw fixed; linked-server error remains

In short

The update fixes a critical remote-code-execution vulnerability and three other issues in SQL Server 2017. Linked-server queries using MSDASQL can still fail with error 7416.

Does it affect you? Applies to: The package is for x64-based SQL Server 2017. It applies to SQL Server 2017 or any SQL Server 2017 CU release through CU31 GDR.

Build
14.0.3540.1
Servicing branch
CU
Security
4 fixed · 1 critical
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

Fixes 4 changes

Integration Services

For: SQL Server instances using Integration Services

  • The fix restricts MessageQueueTask deserialization to help prevent remote code execution from untrusted MSMQ messages.1
    Restricts SoapFormatter deserialization using an allow list binder.

Query Execution

For: SQL Server instances using these query diagnostics

  • A memory leak is fixed when sys.dm_exec_input_buffer or the DBCC INPUTBUFFER command is used.2
    The leak occurs when the sys.dm_exec_input_buffer dynamic management function (DMF) or DBCC INPUTBUFFER is used.

Replication

For: SQL Server instances using replication

  • Input passed to an internal replication stored procedure is validated and sanitized before the procedure uses it.3
    Adds input validation and sanitization for a parameter passed to an internal replication stored procedure.

SQL Agent

For: SQL Server instances using SQL Agent

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

Known issues

  1. Open Affects: Everyone

    Linked server queries that use MSDASQL fail with error 7416

    Linked-server queries using the MSDASQL provider and a provider string (@provstr) fail with error 7416. The error says 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
CU
Restart
Required
Replaces
KB5090354, KB5084818, KB5077471, KB5068402
+8 earlier KB5065225, KB5063759, KB5058714, KB5050533, KB5046858, KB5046061, KB5042215, KB5040940
Replaced by
KB5122774
VersionBuildChannel
2017 14.0.3540.1 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
543.1 MB
sqlserver2017-kb5102337-x64.exe Main update · KB5102337 SHA-1: 4254c733…32da63

Updated components

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

Top changed componentsFiles
SQL Server Engine94
SQL Server PolyBase2

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. The restriction prevents remote code execution (RCE) from untrusted Microsoft Message Queuing (MSMQ) message. 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 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