A heap-based buffer overflow in the sixelencoderoutputwithoutmacro function in encoder.c of Libsixel 1.8.4 allows attackers to cause a denial of service (DOS) via converting a crafted PNG file into Sixel format.

libsixel 1.8.4 has an integer overflow in sixelframeresize in frame.c.

An issue was discovered in libsixel 1.8.4. There is a heap-based buffer overflow in the function gifoutcode at fromgif.c.

An issue was discovered in libsixel 1.8.4. There is a heap-based buffer overflow in the function gifinitframe at fromgif.c.