Heap-based buffer overflow in the convert_to_idna function in WWW/Library/Implementation/HTParse.c in Lynx 2.8.8dev.1 through 2.8.8dev.4 allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a malformed URL containing a % (percent) character in the domain name.
https://exchange.xforce.ibmcloud.com/vulnerabilities/61007
https://bugs.launchpad.net/ubuntu/+source/lynx-cur/+bug/613254
http://www.vupen.com/english/advisories/2010/2042
http://www.ubuntu.com/usn/USN-1642-1