Keep-alive HTTP and HTTPS connections can remain open and inactive for up to 2 minutes in Node.js 6.16.0 and earlier. Node.js 8.0.0 introduced a dedicated server.keepAliveTimeout which defaults to 5 seconds. The behavior in Node.js 6.16.0 and earlier is a potential Denial of Service (DoS) attack vector. Node.js 6.17.0 introduces server.keepAliveTimeout and the 5-second default.
https://security.netapp.com/advisory/ntap-20190502-0008/
https://security.gentoo.org/glsa/202003-48
https://nodejs.org/en/blog/vulnerability/february-2019-security-releases/
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00046.html
http://lists.opensuse.org/opensuse-security-announce/2019-03/msg00041.html