parsetagx.c in w3m before 0.5.3+git20161009 does not properly initialize values, which allows remote attackers to crash the application via a crafted html file, related to a <i> tag.
https://security.gentoo.org/glsa/201701-08
https://github.com/tats/w3m/issues/16
https://github.com/tats/w3m/commit/33509cc81ec5f2ba44eb6fd98bd5c1b5873e46bd
http://www.securityfocus.com/bid/94407
http://www.openwall.com/lists/oss-security/2016/11/18/3
http://lists.opensuse.org/opensuse-updates/2016-12/msg00084.html