The LZW decompressor in the LWZReadByte function in giftoppm.c in the David
Koblas GIF decoder in PBMPLUS, as used in the gif_read_lzw function in
filter/image-gif.c in CUPS before 1.4.7, the LZWReadByte function in
plug-ins/common/file-gif-load.c in GIMP 2.6.11 and earlier, the LZWReadByte
function in img/gifread.c in XPCE in SWI-Prolog 5.10.4 and earlier, and
other products, does not properly handle code words that are absent from
the decompression table when encountered, which allows remote attackers to
trigger an infinite loop or a heap-based buffer overflow, and possibly
execute arbitrary code, via a crafted compressed stream, a related issue to
CVE-2006-1168 and CVE-2011-2895.

mdeslaur