Unspecified vulnerability in Publisher 2007 in Microsoft Office 2007 allows remote attackers to execute arbitrary code via unspecified vectors, related to a "file format vulnerability." NOTE: this information is based upon a vague pre-advisory with no actionable information. However, the advisory is from a reliable source.
http://www.securityfocus.com/bid/22702
http://research.eeye.com/html/advisories/upcoming/20070216.html