A vulnerability has been discovered and corrected in libxfont: The LZW decompressor in the BufCompressedFill function in fontfile/decompress.c in X.Org libXfont before 1.4.4 and compress/compress.c in 4.3BSD, as used in zopen.c in OpenBSD before 3.8, FreeBSD, NetBSD, 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 . The updated packages have been patched to correct this issue.