The Security Update for SQL Server 2019 RTM CU18 is now available for download at the Microsoft Download Center and Microsoft Update Catalog sites. This package cumulatively includes all previous SQL Server 2019 fixes through CU18, plus it includes the new security fixes detailed in the KB Article.
Security Bulletins: CVE-2023-21528 – Security Update Guide – Microsoft – Microsoft SQL Server Remote Code Execution Vulnerability CVE-2023-21704 – Security Update Guide – Microsoft – Microsoft ODBC Driver for SQL Server Remote Code Execution Vulnerability CVE-2023-21705 – Security Update Guide – Microsoft – Microsoft SQL Server Remote Code Execution