CVE-2026-7845 Langchain-Chatchat弱哈希漏洞

import hashlib from PIL import Image import io # Conceptual PoC for Weak Hash Collision in Image Handling # This script demonstrates how image data is converted to bytes and hashed # In the vulnerable version, a weak hash mechanism is used. def generate_collision_image(): # Create a dummy image img = Image.new('RGB', (100, 100), color = 'red') # Convert to bytes as done in the vulnerable function img_bytes = img.tobytes() # Simulate the weak hash usage (e.g., using a simple checksum or short hash) # Assuming the vulnerability involves predictable or collidable hashes weak_hash = hash(img_bytes) # Python's built-in hash is randomized per session, but illustrates the point print(f"Image Bytes Length: {len(img_bytes)}") print(f"Weak Hash Value: {weak_hash}") # An attacker would craft image_data that results in a specific hash collision # to bypass checks or corrupt storage integrity. return img_bytes if __name__ == "__main__": data = generate_collision_image() print("PoC executed: Image data processed with weak hash.")