CVE-2012-2459: Critical Vulnerability
A denial-of-service vulnerability that affects all versions of
bitcoind and Bitcoin-Qt has been reported and fixed. An attacker
could isolate a victim's node and cause the creation of blockchain
Because this bug could be exploited to severely disrupt the Bitcoin
network we consider this a critical vulnerability, and encourage
everybody to upgrade to the latest version: 0.6.2.
Backports for older releases (0.5.5 and 0.4.6) are also available if
you cannot upgrade to version 0.6.2.
Full technical details are being withheld to give people the
opportunity to upgrade.