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CVE-2025-64439— LangGraph Checkpoint affected by RCE in "json" mode of JsonPlusSerializer

Quick assessment

Affected
langchain-ai langgraph
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

langgraph是LangChain开源的一个大模型框架。 langgraph 2.1.2及以下版本存在代码问题漏洞，该漏洞源于JsonPlusSerializer在反序列化json模式保存的有效载荷时存在远程代码执行漏洞。

AI Predicted 8.8 Difficulty: Easy EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services
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I. Basic Information for CVE-2025-64439

Vulnerability Information
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Vulnerability Title
LangGraph Checkpoint affected by RCE in "json" mode of JsonPlusSerializer
Source: CVE Program / CVE List V5
Vulnerability Description
LangGraph SQLite Checkpoint is an implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via aiosqlite). In versions 2.1.2 and below, the JsonPlusSerializer (used as the default serialization protocol for all checkpointing) contains a Remote Code Execution (RCE) vulnerability when deserializing payloads saved in the "json" serialization mode. By default, the serializer attempts to use "msgpack" for serialization. However, prior to version 3.0 of the checkpointer library, if illegal Unicode surrogate values caused serialization to fail, it would fall back to using the "json" mode. This issue is fixed in version 3.0.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
langgraph 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
langgraph是LangChain开源的一个大模型框架。 langgraph 2.1.2及以下版本存在代码问题漏洞，该漏洞源于JsonPlusSerializer在反序列化json模式保存的有效载荷时存在远程代码执行漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langgraph < 3.0.0 -

II. Public POCs for CVE-2025-64439

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III. Intelligence Information for CVE-2025-64439

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Vendor Advisories for CVE-2025-64439 (1)

IV. Related Vulnerabilities

Same product: langgraph
Same vendor: langchain-ai
Same weakness: CWE-502

V. Comments for CVE-2025-64439

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