Ubuntu Security Notice 3214-1 - 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.
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Gentoo Linux Security Advisory 201701-8 - Multiple vulnerabilities have been found in w3m, the worst of which could lead to the execution of arbitrary code. Versions less than 0.5.3-r9 are affected.
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