Stack-based buffer overflow in the cf2_hintmap_build function in cff/cf2hints.c in FreeType before 2.5.3 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a large number of stem hints in a font file.
http://www.ubuntu.com/usn/USN-2148-1
http://www.securitytracker.com/id/1029895
http://www.securityfocus.com/bid/66074
http://www.freetype.org/index.html
http://sourceforge.net/projects/freetype/files/freetype2/2.5.3
http://secunia.com/advisories/57447