Multiple heap-based buffer overflows in XnView before 1.99 allow remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a (1) SGI32LogLum compressed TIFF image or (2) SGI32LogLum compressed TIFF image with the PhotometricInterpretation encoding set to LogL.
http://www.protekresearchlab.com/index.php?option=com_content&view=article&id=49
http://www.protekresearchlab.com/index.php?option=com_content&view=article&id=48