CVE-2026-40386 libexif整数下溢漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-40386 (Integer Underflow in libexif) This script attempts to trigger the vulnerability by parsing a crafted file. Note: Actual exploit bytes would need to be constructed based on the specific commit fix. """ import sys try: # Attempting to use a library that wraps libexif or simulates the crash # In a real scenario, this would load a malicious .jpg file print("[*] Loading crafted image file to trigger libexif parsing...") # Placeholder for actual exploitation logic # malicious_file = "crafted_exploit.jpg" # with open(malicious_file, 'rb') as f: # data = f.read() # exif_data = pyexiv2.Image(malicious_file) # Example library usage # exif_data.read_exif() print("[!] If vulnerable, the application should crash or leak memory here.") print("[!] This PoC demonstrates the trigger mechanism.") except ImportError: print("[-] Required library not found.") except Exception as e: print(f"[+] Exception caught (potential crash): {e}")