Deserialization of Untrusted Data Affecting langgraph-checkpoint package, versions [,4.0.0)

langgraph-checkpoint is a library with base interfaces for LangGraph checkpoint savers.

Affected versions of this package are vulnerable to Deserialization of Untrusted Data via the BaseCache class when cache backends inheriting from BaseCache are enabled, and nodes are opted into caching. An attacker can execute arbitrary code by writing maliciously crafted data to the cache backend, which is later deserialized by the application.

Note: This is only exploitable if a cache backend is explicitly enabled, nodes are opted into caching, and the attacker has write access to the cache storage layer (such as a network-accessible Redis instance with weak or no authentication, shared cache infrastructure, or a writable SQLite cache file).

from langgraph.cache.memory import InMemoryCache
from langgraph.graph import StateGraph
from langgraph.types import CachePolicy


def my_node(state: dict) -> dict:
    return {"value": state.get("value", 0) + 1}


builder = StateGraph(dict)
builder.add_node("my_node", my_node, cache_policy=CachePolicy(ttl=120))
builder.set_entry_point("my_node")

graph = builder.compile(cache=InMemoryCache())

result = graph.invoke({"value": 1})

Serialization is a process of converting an object into a sequence of bytes which can be persisted to a disk or database or can be sent through streams. The reverse process of creating object from sequence of bytes is called deserialization. Serialization is commonly used for communication (sharing objects between multiple hosts) and persistence (store the object state in a file or a database). It is an integral part of popular protocols like Remote Method Invocation (RMI), Java Management Extension (JMX), Java Messaging System (JMS), Action Message Format (AMF), Java Server Faces (JSF) ViewState, etc.

Deserialization of untrusted data (CWE-502) is when the application deserializes untrusted data without sufficiently verifying that the resulting data will be valid, thus allowing the attacker to control the state or the flow of the execution.

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