Exposure of Sensitive System Information to an Unauthorized Control Sphere

Summary

A vulnerability in langchain-core versions 0.1.17 through 0.1.52, 0.2.0rc1 through 0.2.42, and 0.3.0.dev0 through 0.3.14 allows unauthorized users to read arbitrary files from the host file system. The issue arises from the ability to create `langchain_core.prompts.ImagePromptTemplate's` (and by extension `langchain_core.prompts.ChatPromptTemplate's`) with input variables that can read any user-specified path from the server file system. If the outputs of these prompt templates are exposed to the user, either directly or through downstream model outputs, it can lead to the exposure of sensitive information.