libimageworsener.a in ImageWorsener before 1.3.1 has "left shift cannot be represented in type int" undefined behavior issues, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a crafted image, related to imagew-bmp.c and imagew-util.c.
https://security.gentoo.org/glsa/201706-06
https://github.com/jsummers/imageworsener/commit/a00183107d4b84bc8a714290e824ca9c68dac738
https://blogs.gentoo.org/ago/2017/04/27/imageworsener-two-left-shift/