GHSA-hmj8-5xmh-5573: libp2p: yamux connection DoS via oversized data frame

Summary The yamux stream multiplexer in py-libp2p does not validate incoming DATA frame lengths against the receive window before reading the frame body. Any peer that completes a standard libp2p handshake can send a single 12-byte frame claiming a 4 GB body, causing the victim's yamux read loop to block indefinitely. This affects the default new_host() configuration and requires no special setup on either side. Details In libp2p/stream_muxer/yamux/yamux.py (lines 915 to 926), the handle_incoming() method dispatches on frame type. When a DATA frame arrives, it reads the body unconditionally: elif typ == TYPE_DATA: try: data = ( await read_exactly(self.secured_conn, length) if length > 0 else b"" ) The length field is taken directly from the wire-decoded frame header, a 32-bit unsigned integer with a maximum value of 4,294,967,295. There is no check that length fits within the stream's receive window (DEFAULT_WINDOW_SIZE = 256 * 1024 bytes). The body read also happens before the code checks whether the referenced stream_id even exists in self.streams (that check is at line 954), so any stream ID triggers the issue. handle_incoming() itself is a single sequential loop with no timeout around the body read. Once read_exactly suspends waiting for data that never comes, the loop cannot process any subsequent frames. Every stream on that yamux connection stops working, and no exception is raised. The same unguarded call appears in the SYN branch at lines 804 to 806, so a crafted SYN frame with a large length field triggers the same stall. The yamux specification (section 3.3) explicitly requires the receiver to reset the stream if a sender transmits more data than the receive window allows. py-libp2p does not enforce this on the receiver side. All three comparable implementations do: go-yamux tracks recvWindow per stream and returns a SendWindowExceeded error on violation; rust-yamux validates frame length against the stream credit; js-libp2p yamux checks frame lengt