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

KB5073177

KB5073177: Security update for SQL Server 2025, GDR branch, January 2026. DBCC stackdump invocation limited to sysadmins

In short

Addresses the Important SQL Server elevation-of-privilege vulnerability CVE-2026-20803 and limits who can invoke a dump file through DBCC stackdump.

Does it affect you? Applies to: Systems running SQL Server 2025 or a SQL Server 2025 GDR release through this release. The listed fix applies to Linux and Windows.

Build
17.0.1050.2
Servicing branch
GDR
Security
1 fixed
Restart
Required

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

Security Infrastructure

  • Only sysadmins can invoke a dump file through DBCC stackdump.1
    Restricts privileges for DBCC stackdump so that only the sysadmin can invoke the dump file.

Technical details

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

Data sheet

Released
2026-01-13
Classification
Security Updates
Type
Cumulative update
Servicing branch
GDR
Restart
Required
Replaced by
KB5077468
VersionBuildChannel
2025 17.0.1050.2 General availability

Security

1 vulnerability fixed
1 important
VulnerabilitySeverityCVSS
CVE-2026-20803
Microsoft SQL Server Elevation of Privilege Vulnerability
 Important 7.2

Downloads (Microsoft Update Catalog)

Package 2025
325.4 MB
sqlserver2025-kb5073177-x64.exe Main update · KB5073177 SHA-1: 3cb6f98b…270365

Sources

Updated
Cited passages from Microsoft's official notes (1)
  1. 1. Restricts privileges for the DBCC stackdump so that only the sysadmin can invoke the dump file. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 1 quoted passage · 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 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