GNU LibreDWG 0.9.3.2564 has a heap-based buffer over-read in bfr_read in decode.c.
https://github.com/LibreDWG/libredwg/issues/179#issuecomment-570447068
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00052.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00046.html