More information about this security flaw is available in the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=2366608 Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
jupyter-server uses only the CSS part of the bootstrap package and therefore it's not affected. See https://github.com/jupyter-server/jupyter_server/issues/1476#issuecomment-2525560150