Buffer overflow in the png_set_PLTE function in libpng before 1.0.65 1.1.x and 1.2.x before 1.2.55 1.3.x 1.4.x before 1.4.18 1.5.x before 1.5.25 and 1.6.x before 1.6.20 allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via a small bit-depth value in an IHDR (aka image header) chunk in a PNG image. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-8126.