Debian Security Advisory DSA 736-1 – A vulnerability was recently found in the way that SpamAssassin parses certain email headers. This vulnerability could cause SpamAssassin to consume a large number of CPU cycles when processing messages containing these headers, leading to a potential denial of service (DOS) attack.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/38396/dsa-736-1.txt
Source: https://packetstormsecurity.com/files/38396/Debian-Linux-Security-Advisory-736-1.html