Maintainers for libcurl3-gnutls are Debian Curl Maintainers <team+curl@tracker.debian.org>.
You may want to refer to the following packages that are part of the same source: curl, libcurl3-nss, libcurl3t64-gnutls, libcurl4, libcurl4-doc, libcurl4-gnutls-dev, libcurl4-nss-dev, libcurl4-openssl-dev, libcurl4t64.
You might like to refer to the libcurl3-gnutls package page, to the Package Tracking System, or to the source package src:curl's bug page.
If you find a bug not listed here, please report it.