The iw_process_cols_to_intermediate function in imagew-main.c in libimageworsener.a in ImageWorsener before 1.3.1 allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted image.
https://security.gentoo.org/glsa/201706-06
https://github.com/jsummers/imageworsener/commit/86564051db45b466e5f667111ce00b5eeedc8fb6