LangChain affected by SSRF via image_url token counting in ChatOpenAI.get_num_tokens_from_messages

Server-Side Request Forgery SSRF in ChatOpenAI Image Token Counting Summary The ChatOpenAI.getnumtokensfrommessages method fetches arbitrary imageurl values without validation when computing token counts for vision-enabled models. This allows attackers to trigger Server-Side Request Forgery SSRF...