Maintainers for xmlsec1 are Debian XML/SGML Group <debian-xml-sgml-pkgs@lists.alioth.debian.org>.
You may want to refer to the following individual bug pages: libxmlsec1, libxmlsec1-dev, libxmlsec1-doc, libxmlsec1-gcrypt, libxmlsec1-gnutls, libxmlsec1-nss, libxmlsec1-openssl, libxmlsec1t64, libxmlsec1t64-gcrypt, libxmlsec1t64-gnutls, libxmlsec1t64-nss, libxmlsec1t64-openssl.
You might like to refer to the xmlsec1 package page, or to the Package Tracking System.
If you find a bug not listed here, please report it.