Thank you to Stefan Goßner,who for many years has been publishing these fantastic post!
December 2023 CU for SharePoint Server 2016 is available for download - https://blog.stefan-gossner.com/2023/12/12/december-2023-cu-for-sharepoint-server-2016-is-available-for-download/
December 2023 CU for SharePoint Server 2019 is available for download - https://blog.stefan-gossner.com/2023/12/12/december-2023-cu-for-sharepoint-server-2019-is-available-for-download/
December 2023 CU for SharePoint Server Subscription Edition is available for download - https://blog.stefan-gossner.com/2023/12/12/december-2023-cu-for-sharepoint-server-subscription-edition-is-available-for-download/
Please be advise that end of life is approaching quickly for both SharePoint 2016 and SharePoint 2019 and you should start planning to migrate to Microsoft 365/SharePoint Online
Time to patch m/thisy blog (Yes it is running SharePoint 2019!)!