gv 3.5.8, and possibly earlier versions, allows remote attackers to execute arbitrary commands via shell metacharacters in the filename for (1) a PDF file or (2) a gzip file.
https://exchange.xforce.ibmcloud.com/vulnerabilities/10231
http://www.securityfocus.com/bid/5840
http://marc.info/?l=bugtraq&m=103348446009076&w=2
http://archives.neohapsis.com/archives/bugtraq/2002-10/0033.html