http://service.real.com/help/faq/security/050224_player/EN/ reports a flaw in Realplayer allowing a malicious .wav file to execute arbitrary code, this is critical.
->realplayer component
Marking MODIFIED for QA
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on the solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2005-265.html