CVE-2016-10518

A vulnerability was found in the ping functionality of the ws module before
1.0.0 which allowed clients to allocate memory by sending a ping frame. The
ping functionality by default responds with a pong frame and the previously
given payload of the ping frame. This is exactly what you expect, but
internally ws always transforms all data that we need to send to a Buffer
instance and that is where the vulnerability existed. ws didn’t do any
checks for the type of data it was sending. With buffers in node when you
allocate it when a number instead of a string it will allocate the amount
of bytes.