Multiple buffer overflows in the png_set_PLTE and png_get_PLTE functions in libpng before 1.0.64, 1.1.x and 1.2.x before 1.2.54, 1.3.x and 1.4.x before 1.4.17, 1.5.x before 1.5.24, and 1.6.x before 1.6.19, allowing remote attackers to cause a denial of service or possibly have unspecified other impact via a small bit-depth value in an IHDR chunk in a PNG image .