August/2021 - HAProxy 2.0+ HTTP/2 Vulnerabilities Fixed
If you are using HAProxy 2.0 or newer, it is important that you update to the latest version. A vulnerability was found that makes it possible to abuse the HTTP/2 parser, allowing an attacker to prepend hostnames to a request, append top-level domains to an existing domain, and inject invalid characters through the :method pseudo-header.