The HTTP header parsing code in Node.js 0.10.x before 0.10.42, 0.11.6 through 0.11.16, 0.12.x before 0.12.10, 4.x before 4.3.0, and 5.x before 5.6.0 allows remote attackers to bypass an HTTP response-splitting protection mechanism via UTF-8 encoded Unicode characters in the HTTP header, as demonstrated by %c4%8d%c4%8a.
https://security.gentoo.org/glsa/201612-43
https://nodejs.org/en/blog/vulnerability/february-2016-security-releases/
http://www.securityfocus.com/bid/83141
http://packetstormsecurity.com/files/135711/Node.js-HTTP-Response-Splitting.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177673.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177184.html
http://info.safebreach.com/hubfs/Node-js-Response-Splitting.pdf
http://blog.safebreach.com/2016/02/09/http-response-splitting-in-node-js-root-cause-analysis/