CVE-2025-68665

Описание

LangChain is a framework for building LLM-powered applications. Prior to @langchain/core versions 0.3.80 and 1.1.8, and prior to langchain versions 0.3.37 and 1.2.3, a serialization injection vulnerability exists in LangChain JS's toJSON() method (and subsequently when string-ifying objects using JSON.stringify(). The method did not escape objects with 'lc' keys when serializing free-form data in kwargs. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate LangChain object during deserialization rather than plain user data. This issue has been patched in @langchain/core versions 0.3.80 and 1.1.8, and langchain versions 0.3.37 and 1.2.3

A flaw was found in LangChain. A remote attacker could exploit a serialization injection vulnerability in the toJSON() method. This occurs because the method fails to properly escape objects containing 'lc' keys during serialization of free-form data. When user-controlled data includes this key structure, it is incorrectly processed as a legitimate LangChain object during deserialization, which could lead to arbitrary code execution.