Pioneers (formerly gnocatan) before 0.11.3 allows remote attackers to cause a denial of service (crash) by triggering a delete operation while the Session object is still being used, as demonstrated by causing a "Broken pipe" error.
http://www.securityfocus.com/bid/26391
http://sourceforge.net/tracker/index.php?func=detail&aid=1791176&group_id=5095&atid=305095
http://securitytracker.com/id?1019024
http://security.gentoo.org/glsa/glsa-200711-20.xml
http://secunia.com/advisories/27646
http://secunia.com/advisories/27522