CVE-2026-32739 libheif无限循环导致拒绝服务漏洞

import sys # PoC Concept for CVE-2026-32739 # This script demonstrates how a vulnerable application might trigger the bug # when attempting to parse a crafted HEIF file. # Note: Creating the specific 800-byte HEIF payload requires deep knowledge # of the ISO Base Media File Format. Below is a simulation of how the # vulnerable function would be called. def trigger_vulnerability(file_path): try: # In a real scenario, this would call a library like pillow-heif or raw libheif # which internally calls Box_stts::get_sample_duration() print(f"[*] Attempting to parse file: {file_path}") # Simulate the parsing logic that leads to the infinite loop # This represents the vulnerable code path in libheif <= 1.21.2 print("[!] Vulnerable function Box_stts::get_sample_duration() called...") print("[!] CPU usage spikes to 100%. Infinite loop reached.") # Real execution would hang here. while True: pass except KeyboardInterrupt: print("\n[-] Process interrupted by user.") if __name__ == "__main__": # In a real exploit, 'malicious.heif' would be the crafted 800-byte file print("[+] CVE-2026-32739 PoC Trigger") print("[+] This simulates the effect of opening the malicious file.") # trigger_vulnerability("malicious.heif")