A vulnerability was found in chatchat-space Langchain-Chatchat up to 0.3.1.3 . It has been rated as problematic . This issue affects the function PIL.Image.tobytes of the file libs/chatchat-server/chatchat/webui_pages/dialogue/dialogue.py of the component Vision Chat Paste Image Handler . This manipulation of the argument paste_image.image_data causes use of weak hash. This vulnerability appears as CVE-2026-7845 . The attacker needs to be present on the local network. In addition, an exploit is