Mandriva Linux Security Advisory 2009-254 – Stack-based buffer overflow in the push_subg function in parser.y (lib/graph/parser.c) in Graphviz 2.20.2, and possibly earlier versions, allows user-assisted remote attackers to cause a denial of service (memory corruption) or execute arbitrary code via a DOT file with a large number of Agraph_t elements. This update provides a fix for this vulnerability.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/81766/MDVSA-2009-254.txt
Source: https://packetstormsecurity.com/files/81766/Mandriva-Linux-Security-Advisory-2009-254.html