There is a floating point exception error in sixelencoderdoresize, encoder.c:633 in libsixel img2sixel 1.8.6. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted JPEG file.

There is an assertion failure error in stbijpeghuffdecode, stbimage.h:1894 in libsixel img2sixel 1.8.6. Remote attackers could leverage this vulnerability to cause a denial-of-service via a crafted JPEG file.

libsixel 1.8.6 is affected by Buffer Overflow in libsixel/src/quant.c:876.

libsixel 1.8.6 suffers from a Heap Use After Free vulnerability in in libsixel/src/dither.c:388.

In libsixel 1.8.6, sixelencoderoutputwithoutmacro (called from sixelencoderencodeframe in encoder.c) has a double free.

Buffer Overflow in the "sixelencoderencodebytes" function of Libsixel v1.8.6 allows attackers to cause a Denial of Service (DoS).

Unverified indexs into the array lead to out of bound access in the gifoutcode function in fromgif.c in libsixel 1.8.6.

loadpng in loader.c in libsixel.a in libsixel 1.8.6 has an uninitialized pointer leading to an invalid call to free, which can cause a denial of service.