# v4.3.23

## Enhancements

- Added topic validation for `emqx_mod_rewrite`. The dest topics contains wildcards are not allowed to publish [#9359](https://github.com/emqx/emqx/issues/9359).

- Print a warning message when boot with the default (insecure) Erlang cookie [#9340](https://github.com/emqx/emqx/pull/9340).

- Improve node name generation rules to avoid potential atom table overflow risk [#9391](https://github.com/emqx/emqx/pull/9391).

## Bug fixes

- Fix a bug where the JWT ACL would not short-circuit with a deny response when the token is expired [#9338](https://github.com/emqx/emqx/pull/9338).

- Added check for target version when unpacking a package for hot-upgrade.  The unpacking could lead to unresponsive node commands.  [#9470](https://github.com/emqx/emqx/pull/9470)