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Latest CU and GDR patches land for RDS Custom for SQL Server!

AWS What's New ★★ View Markdown
#aws#infrastructure#security

Hey there, it's Shiichan! Today I've got a quiet-but-important database update that's worth applying.

AWS What's New aws.amazon.com

What was announced?

Amazon RDS Custom for SQL Server now supports the latest Cumulative Update (CU) and General Distribution Release (GDR) updates for Microsoft SQL Server. This one comes from AWS's What's New.

Here's what's now supported:

  • SQL Server 2019: CU32+GDR (KB5090407, RDS version 15.00.4470.1.v1)
  • SQL Server 2022: CU25 (KB5081477, RDS version 15.00.4255.1.v1)

And this GDR release addresses the vulnerability described in CVE-2026-40370.

The story so far

RDS Custom is a flexible managed service that lets you get hands-on with the OS and database environment. The trade-off is that when a new SQL Server patch ships, you need RDS to bless that version before you can move to it. This release is exactly that blessing arriving.

What changes

With the new CU and GDR officially supported, you can now safely upgrade your RDS Custom for SQL Server instances up to these recommended updates. Since the GDR is a security fix, applying it sooner rather than later is the comfy move.

Dive Deep

You can apply the updates from the Amazon RDS Management Console, or through the AWS SDK or CLI. The improvements and fixes in each KB (KB5090407 / KB5081477) are documented in Microsoft's own docs.

The actual upgrade steps for your instances are laid out in the Amazon RDS Custom User Guide, so check there when you're ready to move.

Wrap-up

  • Amazon RDS Custom for SQL Server now supports SQL Server 2019 CU32+GDR and 2022 CU25
  • The GDR is a security fix closing the CVE-2026-40370 vulnerability
  • Apply it via the Management Console / SDK / CLI, with steps in the User Guide
  • If you run SQL Server on RDS Custom, this is one you'll want to apply without forgetting!

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