CVE-2025-68665

Summary

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

Affected Software

VendorProductVersion RangeStatus
langchain-ailangchainjs@langchain/core >= 1.0.0, < 1.1.8affected
langchain-ailangchainjs@langchain/core < 0.3.80affected
langchain-ailangchainjslangchain >= 1.0.0, < 1.2.3affected
langchain-ailangchainjslangchain < 0.3.37affected

Weaknesses

  • CWE-502: CWE-502: Deserialization of Untrusted Data

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: poc
    • Automatable: yes
    • Technical Impact: partial

Additional References

References