The aspath_prepend function in rde_attr.c in bgpd in OpenBSD 4.3 and 4.4 allows remote attackers to cause a denial of service (application crash) via an Autonomous System (AS) advertisement containing a long AS path.
https://exchange.xforce.ibmcloud.com/vulnerabilities/48812
http://www.securitytracker.com/id?1021736
http://www.securityfocus.com/bid/33828
http://secunia.com/advisories/33975