Web Push Denial of Service via malicious Web Push endpoint
Prior to version 0.10.3, the built-in clients of the web-push crate eagerly allocated memory based on the Content-Length header returned by the Web Push endpoint. Malicious Web Push endpoints could return a large Content-Length without ever having to send as much data, leading to denial of service by memory exhaustion. Services providing Web Push notifications typically allow the user to register an arbitrary endpoint, so the endpoint should not be …