quic-go is an implementation of the QUIC protocol (RFC 9000, RFC 9001, RFC 9002) in Go. An attacker can cause its peer to run out of memory sending a large number of PATHCHALLENGE frames. The receiver is supposed to respond to each PATHCHALLENGE frame with a PATHRESPONSE frame. The attacker can prevent the receiver from sending out (the vast majority of) these PATHRESPONSE frames by collapsing the peers congestion window (by selectively acknowledging received packets) and by manipulating the peer's RTT estimate. This vulnerability has been patched in versions 0.37.7, 0.38.2 and 0.39.4.