CVE-2025-68664
CriticalSummary
LangChain, a framework for building agents and LLM-powered applications, prior to versions 0.3.81 and 1.2.5 has a serialization injection vulnerability in its 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.
Risk Assessment
The risk includes potential unauthorized operations or manipulation of LangChain objects, potentially leading to application integrity compromise and possible remote code execution.
Recommendation
Update LangChain to version 0.3.81 or 1.2.5, which contain the fix for this vulnerability.
Original NVD description (English source)
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 LangChain's 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.