A security issue affects these releases of Ubuntu and its derivatives:
Ubuntu 14.04 LTS
Ubuntu 12.04 LTS
Several security issues were fixed in w3m.
w3m – WWW browsable pager with excellent tables/frames support
A large number of security issues were discovered in the w3m browser. If a user were tricked into viewing a malicious website, a remote attacker could exploit a variety of issues related to web browser security, including cross-site scripting attacks, denial of service attacks, and arbitrary code execution.
The problem can be corrected by updating your system to the following package version: