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CVE-2026-28277— LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading

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 1.0.9及之前版本存在代码问题漏洞，该漏洞源于反序列化过程中可能重建Python对象，可能导致不安全的对象重建。

CVSS 6.8 · Medium EPSS 0.62% · P48
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I. Basic Information for CVE-2026-28277

Vulnerability Information
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Vulnerability Title
LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading
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 version 1.0.9 and prior, LangGraph checkpointers can load msgpack-encoded checkpoints that reconstruct Python objects during deserialization. If an attacker can modify checkpoint data in the backing store (for example, after a database compromise or other privileged write access to the persistence layer), they can potentially supply a crafted payload that triggers unsafe object reconstruction when the checkpoint is loaded. No known patch is public.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A: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 1.0.9及之前版本存在代码问题漏洞，该漏洞源于反序列化过程中可能重建Python对象，可能导致不安全的对象重建。
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 <= 1.0.9 -

II. Public POCs for CVE-2026-28277

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III. Intelligence Information for CVE-2026-28277

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Vendor Advisories for CVE-2026-28277 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-28277

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