BleepingComputer.com: Five Security Flaws In Ipv6

Ready or not, IPv6 is finally visible on the horizon... And researchers are already finding major security problems with it...researchers recently found problems in the IPv6 protocol specification itself, namely in the routing header. Bottom line: The specification lets the sender add an arbitrary number of extra headers on IPv6 packets, and the IPv6-based routers or hosts must process these headers. It's a denial-of-service attacker's dream come true...