Maintainers for mapserver are Debian GIS Project <pkg-grass-devel@lists.alioth.debian.org>.
You may want to refer to the following individual bug pages: cgi-mapserver, libmapscript-java, libmapscript-perl, libmapserver-dev, libmapserver2, libmapserver2t64, mapserver-bin, mapserver-doc, php-mapscript, php-mapscript-ng, python-mapscript, python3-mapscript, ruby-mapscript.
You might like to refer to the mapserver package page, or to the Package Tracking System.
If you find a bug not listed here, please report it.