Security Advisory
CVE-2025-68664
CVE vulnerability detail — eXtreme Datacenter Security Operations
Description
LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChains dumps() and dumpd() functions. The functions do not escape dictionaries with lc keys when serializing free-form dictionaries. 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 versions 0.3.81 and 1.2.5.