Maintainers for libapache2-mod-shib2 are Debian Shib Team <pkg-shibboleth-devel@alioth-lists.debian.net>.
You may want to refer to the following packages that are part of the same source: libapache2-mod-shib, libshibsp-dev, libshibsp-doc, libshibsp-plugins, libshibsp10, libshibsp11, libshibsp11t64, libshibsp8, shibboleth-sp-common, shibboleth-sp-utils, shibboleth-sp2-common, shibboleth-sp2-utils.
You might like to refer to the libapache2-mod-shib2 package page, to the Package Tracking System, or to the source package src:shibboleth-sp's bug page.
If you find a bug not listed here, please report it.