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CVE-2025-68665
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Date: December 23, 2025
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
Severity Score
Related Resources (7)
Severity Score
Weakness Type (CWE)
Deserialization of Untrusted Data
CWE-502Top Fix
Upgrade Version
Upgrade to version @langchain/core - 1.1.8;@langchain/core - 0.3.80;langchain - 1.2.3;langchain - 0.3.37;https://github.com/langchain-ai/langchainjs.git - langchain@0.3.37;https://github.com/langchain-ai/langchainjs.git - langchain@1.2.3;https://github.com/langchain-ai/langchainjs.git - @langchain/core@0.3.80;https://github.com/langchain-ai/langchainjs.git - @langchain/core@1.1.8
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | CHANGED |
| Confidentiality (C): | HIGH |
| Integrity (I): | NONE |
| Availability (A): | NONE |