The utf-16 decoder in Python 3.1 through 3.3 does not update the aligned_end variable after calling the unicode_decode_call_errorhandler function, which allows remote attackers to obtain sensitive information (process memory) or cause a denial of service (memory corruption and crash) via unspecified vectors.
http://www.ubuntu.com/usn/USN-1616-1
http://www.ubuntu.com/usn/USN-1615-1
http://www.openwall.com/lists/oss-security/2012/04/25/4
http://www.openwall.com/lists/oss-security/2012/04/25/2
http://secunia.com/advisories/51089
http://secunia.com/advisories/51087