GNU LibreDWG 0.9.3.2564 ha un buffer heap over-letto in read_pages_map in decode_r2007.c.
https://github.com/LibreDWG/libredwg/issues/179#issue-544834443
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00046.html
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00052.html
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6609