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

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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 (CVE-2025-68665)

ID	Name	Product	Family	Type	Severity
459237	Echo: @langchain/core, langchain: security update to 0.3.37	Tenable Cloud Security	Echo Local Security Checks	Local	critical
459237	Echo: @langchain/core, langchain: security update to 0.3.37	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	critical
436485	SCA: security update for @langchain/core, langchain (GHSA-r399-636x-v7f6)	Tenable Cloud Security	SCA Checks	Local	critical
436485	SCA: security update for @langchain/core, langchain (GHSA-r399-636x-v7f6)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical

Detections

Analytics

CVE-2025-68665

critical

Tenable Plugins

critical

critical

critical

critical