This is what I get on an unpatched staging server. Not sure it did anything...

    $ sudo convert file.mvg o.png
    convert.im6: delegate failed `"curl" -s -k -o "%o" "https:%M"' @ error/delegate.c/InvokeDelegate/1065.
    convert.im6: unable to open image `/tmp/magick-Yjc5q9f1': No such file or directory @ > error/blob.c/OpenBlob/2638.
    convert.im6: unable to open file `/tmp/magick-Yjc5q9f1': No such file or directory @ error/constitute.c/ReadImage/583.