XnView is "A software to view and convert graphic files, really simple to use!". NConvert is "a batch utility to convert graphic files!". GFL SDK is "a free library (used by XnView) for developers who would like to support graphics image formats easily." Secunia Research has discovered a vulnerability in XnView, NConvert, and GFL SDK, which can be exploited by malicious people to compromise a user's system.

http://www.securiteam.com/securitynews/5VP0N15OKO.html