Mandriva Linux Security Advisory – A flaw in libgd2 was found by Xavier Roche where it would not correctly validate PNG callback results. If an application linked against libgd2 was tricked into processing a specially-crafted PNG file, it could cause a denial of service scenario via CPU resource consumption.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/57173/MDKSA-2007-122.txt
Source: https://packetstormsecurity.com/files/57173/Mandriva-Linux-Security-Advisory-2007.122.html