Mandriva Security Advisory – An algorithmic complexity vulnerability in Snort before 2.6.1, during predicate evaluation in rule matching for certain rules, allows remote attackers to cause a denial of service (CPU consumption and detection outage) via crafted network traffic, aka a backtracking attack.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/54817/MDKSA-2007-051.txt
Source: https://packetstormsecurity.com/files/54817/Mandriva-Linux-Security-Advisory-2007.051.html