Maintainers for winbind are Debian Samba Maintainers <pkg-samba-maint@lists.alioth.debian.org>.
You may want to refer to the following packages that are part of the same source: ctdb, ldb-tools, libldb-dev, libldb2, libnss-winbind, libpam-winbind, libsmbclient, libsmbclient-dev, libsmbclient0, libwbclient-dev, libwbclient0, python-samba, python3-ldb, python3-ldb-dev, python3-samba, registry-tools, samba, samba-ad-dc, samba-ad-provision, samba-common, samba-common-bin, samba-dev, samba-dsdb-modules, samba-libs, samba-testsuite, samba-vfs-modules, smbclient.
You might like to refer to the winbind package page, to the Package Tracking System, or to the source package src:samba's bug page.
If you find a bug not listed here, please report it.