An issue was discovered in FreeXL before 1.0.5. There is a heap-based buffer over-read in the function read_mini_biff_next_record.
https://www.debian.org/security/2018/dsa-4129
https://security.gentoo.org/glsa/202007-44
https://lists.debian.org/debian-lts-announce/2018/03/msg00000.html
https://groups.google.com/forum/#%21topic/spatialite-users/b-d9iB5TDPE