HIGH
Format string vulnerability in the yyerror function in lib/cgraph/scan.l in Graphviz allows remote attackers to have unspecified impact via format string specifiers in unknown vectors, which are not properly handled in an error string.
http://advisories.mageia.org/MGASA-2014-0520.html
http://seclists.org/oss-sec/2014/q4/784
http://seclists.org/oss-sec/2014/q4/872
http://secunia.com/advisories/60166
http://www.debian.org/security/2014/dsa-3098
http://www.mandriva.com/security/advisories?name=MDVSA-2014:248
http://www.mandriva.com/security/advisories?name=MDVSA-2015:187
http://www.securityfocus.com/bid/71283
https://exchange.xforce.ibmcloud.com/vulnerabilities/98949
https://github.com/ellson/graphviz/commit/99eda421f7ddc27b14e4ac1d2126e5fe41719081