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
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
- github.com /langchain-ai/langchainjs/security/advisories/GHSA-r399-636x-v7f6
- github.com /langchain-ai/langchainjs/commit/e5063f9c6e9989ea067dfdff39262b9e7b6aba62
- github.com /langchain-ai/langchainjs/releases/tag/%40langchain%2Fcore%401.1.8
- github.com /langchain-ai/langchainjs/releases/tag/langchain%401.2.3