[Security][Bug] Prevent binding to all TCP interfaces (#5752)

Author: adarshxs

python/sglang/srt/distributed/device_communicators/shm_broadcast.py

@@ -225,7 +225,8 @@ def __init__(
             remote_subscribe_port = get_open_port()
             if is_valid_ipv6_address(connect_ip):
                 self.remote_socket.setsockopt(IPV6, 1)
-            socket_addr = f"tcp://*:{remote_subscribe_port}"
+                connect_ip = f"[{connect_ip}]"
+            socket_addr = f"tcp://{connect_ip}:{remote_subscribe_port}"
             self.remote_socket.bind(socket_addr)
 
         else: