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Vulnerability · Published Nov 7, 2025 · Assigned by GitHub_M

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

High 7.4

In plain English

A high-severity unsafe deserialization in langgraph from langchain-ai. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 59% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)7.4High
Exploit odds (30 days)0.9%top 40.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
PyPIlanggraph-checkpoint3.0.0GHSA-wwqv-p2pp-99h5
PyPIlanggraph-checkpoint3.0.0PYSEC-2026-1527

Affected products (as reported)

VendorProductVersions
langchain-ai langgraph < 3.0.0

Weakness: CWE-502 · Vector: 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

References