AIKIDO-2026-692879
@langchain/langgraph is vulnerable to Insecure Deserialization
77
High Risk
This Affects:
@langchain/langgraphTL;DR
LangGraph.js restores graph checkpoints with the default JsonPlusSerializer from @langchain/langgraph-checkpoint. In the lc: 2 reviver path that serializer performed dynamic method invocation, using property names and arguments taken from serialized data. Externally influenced checkpoint data could abuse inherited constructor references to reach Function and invoke arbitrary callables during restore. Patched LangGraph releases require a checkpoint version that reconstructs only a fixed allow-list of safe types with strict validation of constructor identifiers and argument shapes.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and your application restores checkpoint data that can contain untrusted structured objects.
Background info
@langchain/langgraph is vulnerable to Insecure Deserialization in versions 0.1.1 - 0.4.9 and 1.0.0 - 1.4.11.
How to fix this
Upgrade the @langchain/langgraph library to the patch version.
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