An error within the "LibRaw::xtrans_interpolate()" function (internal/dcraw_common.cpp) in LibRaw versions prior to 0.18.6 can be exploited to cause an invalid read memory access and subsequently a Denial of Service condition.
https://usn.ubuntu.com/3615-1/
https://secuniaresearch.flexerasoftware.com/secunia_research/2017-19/
https://secuniaresearch.flexerasoftware.com/advisories/76000/
https://github.com/LibRaw/LibRaw/commit/5563e6ddc3f7cb93d98b491194ceebdee7288d36