Ours is a legacy product where it has its heavily hand-crafted hibernate API's based on 3.6.10.Final.
Now I want to evaluate the risk of not upgrading to 4.x or 5.x versions. Upgrading is gonna be a nightmare, just to make it compiling.. :P
But I couldn't find any official info or contract or support pages mentioning the End of support notice on 3.6.10.Final releases [Any releases in general].
https://access.redhat.com/support/policy/updates/jboss_notes/ a. Section "Product Life Cycle Dates/Red Hat JBoss Web Server"
https://hibernate.atlassian.net/projects/HHH?selectedItem=com.atlassian.jira.jira-projects-plugin:release-page& status=unreleased