Leafnode versions 1.9.48 to 1.11.1 suffer from a denial of service vulnerability.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/39083/leafnode-SA-2005-01.txt
Source: https://packetstormsecurity.com/files/39083/leafnode-SA-2005-01.txt.html