The PNG deflate algorithm in RealOne Player 6.0.11.x and earlier, RealPlayer 8/RealPlayer Plus 8 6.0.9.584, and other versions allows remote attackers to corrupt the heap and overwrite arbitrary memory via a PNG graphic file format containing compressed data using fixed trees that contain the length values 286-287, which are treated as a very large length.
http://www.securityfocus.com/bid/7177
http://www.kb.cert.org/vuls/id/705761
http://www.coresecurity.com/common/showdoc.php?idx=311&idxseccion=10
http://marc.info/?l=bugtraq&m=104887465427579&w=2
http://archives.neohapsis.com/archives/vulnwatch/2003-q1/0156.html