CVE 8.6 HIGH

LangChain serialization injection vulnerability enables secret extraction_CVE-2025-68665

8.6 / 10
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Description

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

AI Analysis

Serialization injection vulnerability in LangChain JS's toJSON() method

Basic Information

ID CVE-2025-68665
Source GitHub_M
Published Dec 23, 2025 at 22:56

Affected Product

Vendor langchain-ai
Product langchainjs
Version @langchain/core >= 1.0.0, < 1.1.8
Affected Versions langchain-ai langchainjs @langchain/core >= 1.0.0, < 1.1.8
langchain-ai langchainjs @langchain/core < 0.3.80
langchain-ai langchainjs langchain >= 1.0.0, < 1.2.3
langchain-ai langchainjs langchain < 0.3.37

CWE Classification

AI Assessment

AI Score 8.6 / 10
AI Severity High
Vendor langchain-ai
Product langchainjs
Version @langchain/core < 0.3.80, @langchain/core < 1.1.8, langchain < 0.3.37, langchain < 1.2.3

References

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