The signal handler implementations in socat before 1.7.3.0 and 2.0.0-b8 allow remote attackers to cause a denial of service (process freeze or crash).
https://bugzilla.redhat.com/show_bug.cgi?id=1185711
http://www.securityfocus.com/bid/72321
http://www.openwall.com/lists/oss-security/2015/04/06/4