GNU LibreDWG 0.9.3.2564 has a heap-based buffer over-read in bit_search_sentinel in bits.c.
https://github.com/LibreDWG/libredwg/issues/179#issuecomment-570447025
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00052.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00046.html