The bdecode_recursive function in include/libtorrent/bencode.hpp in Rasterbar Software libtorrent before 0.12.1, as used in Deluge before 0.5.8.3 and other products, allows context-dependent attackers to cause a denial of service (stack exhaustion and crash) via a crafted bencoded message.
https://www.redhat.com/archives/fedora-package-announce/2008-February/msg00001.html
http://www.vupen.com/english/advisories/2008/0384
http://www.vupen.com/english/advisories/2008/0383
http://www.securityfocus.com/bid/27597
http://secunia.com/advisories/28782
http://secunia.com/advisories/28781
http://secunia.com/advisories/28700