KB5077465 — Security Update for SQL Server 2022 GDR

Overview

KB5077465 is a critical security update for Microsoft SQL Server 2022 GDR released on March 10, 2026. This update addresses multiple security vulnerabilities that could potentially compromise database security, including SQL injection vulnerabilities, authentication bypass issues, and privilege escalation flaws.

Security Vulnerabilities Addressed

This security update resolves several high-priority vulnerabilities in SQL Server 2022:

• SQL Injection Vulnerability: Critical flaw in query parameter handling that could allow code execution
• Authentication Bypass: Vulnerability in Windows Authentication mode affecting domain trust scenarios
• Privilege Escalation: Issue in stored procedure execution allowing unauthorized permission elevation
• Denial of Service: Query optimizer vulnerability enabling service disruption through malformed queries
• Information Disclosure: Always Encrypted feature vulnerability potentially exposing encrypted data

Affected Systems

This update applies specifically to:

Systems running SQL Server 2022 Cumulative Update branch are not affected by this specific update as these vulnerabilities are addressed through the regular CU release cycle.

Technical Details

Query Parameter Processing Fix

The most critical fix in KB5077465 addresses a SQL injection vulnerability in the database engine's parameter processing logic. This vulnerability could be exploited when applications use dynamic SQL construction with user-supplied input. The fix implements:

• Enhanced input validation for all query parameters
• Improved sanitization of special characters in SQL strings
• Stricter type checking for parameter binding operations
• Additional logging for suspicious query patterns

Authentication Security Enhancements

The authentication bypass fix strengthens Windows Authentication mode by:

• Implementing additional token validation steps
• Enhancing cross-domain trust verification
• Improving audit logging for authentication events
• Adding timeout mechanisms for authentication processes

Privilege Management Improvements

The privilege escalation fix enhances stored procedure security through:

• Stricter permission inheritance checking
• Enhanced validation of execution context switching
• Improved tracking of privilege elevation attempts
• Additional security boundaries for system procedures

Installation Requirements

System Prerequisites

• Microsoft SQL Server 2022 GDR baseline installation
• Windows Server 2019 or later, or Windows 10/11 for development installations
• Administrative privileges for installation account
• Minimum 1 GB available disk space
• All SQL Server services stopped during installation

Deployment Considerations

Plan deployment carefully in production environments:

• Schedule maintenance windows for service interruption
• Create full database backups before installation
• Test update in development/staging environments first
• Coordinate with application teams for potential compatibility testing
• Monitor system performance after installation

Post-Installation Verification

After installing KB5077465, verify successful deployment:

SELECT @@VERSION;
SELECT * FROM sys.dm_os_installed_updates WHERE hotfix_id = 'KB5077465';

The version string should reflect the updated build number, and the hotfix query should return installation details for KB5077465.

Security Best Practices

While KB5077465 addresses critical vulnerabilities, implement additional security measures:

• Regular security assessments and vulnerability scanning
• Implementation of least-privilege access principles
• Network segmentation for database servers
• Regular monitoring of SQL Server security logs
• Keep client drivers and applications updated