The LZW decompressor in (1) the BufCompressedFill function in fontfile/decompress.c in X.Org libXfont before 1.4.4 and (2) compress/compress.c in 4.3BSD as used in zopen.c in OpenBSD before 3.8 FreeBSD NetBSD 4.0.x and 5.0.x before 5.0.3 and 5.1.x before 5.1.1 FreeType 2.1.9 and other products does not properly handle code words that are absent from the decompression table when encountered which allows context-dependent 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-2011-2896.