GNUnet before SVN revision 2781 allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via an empty UDP datagram, possibly involving FIONREAD errors.
aluigi.altervista.org/adv/gnunetzero-adv.txt
secunia.com/advisories/20096
securityreason.com/securityalert/907
www.securityfocus.com/archive/1/433933/100/0/threaded
www.securityfocus.com/bid/17980
www.vupen.com/english/advisories/2006/1799
exchange.xforce.ibmcloud.com/vulnerabilities/26527
gnunet.org/svn/GNUnet/ChangeLog