An error within the "parse_rollei()" function (internal/dcraw_common.cpp) within LibRaw versions prior to 0.19.1 can be exploited to trigger an infinite loop.
https://www.libraw.org/news/libraw-0-19-2-release
https://usn.ubuntu.com/3989-1/
https://secuniaresearch.flexerasoftware.com/secunia_research/2018-27/
https://lists.debian.org/debian-lts-announce/2019/03/msg00036.html