We have been monitoring a reported flaw with Winamp 5.12 and 5.13. A buffer overflow condition with a playlist containing a long file name can cause the application to crash at best and execute arbitrary code at worst. To date, we are not aware of any POC that uses this vulnerability sucesfully for malicious purposes. This problem is fixed in Winamp 5.2 so users are advised to update. More details about this issue can be found at
http://secunia.com/advisories/18848.