CVE-2025-64439

LangGraph Checkpoint affected by RCE in "json" mode of JsonPlusSerializer

Published Nov 7, 2025 CVSS 4.0 · 7.4 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-wwqv-p2pp-99h5 LangGraph Checkpoint affected by RCE in "json" mode of JsonPlusSerializer
History
Type Values Removed Values Added
First Time appeared Langchain
Langchain langchain
Langchain-ai
Langchain-ai langchain
Vendors & Products Langchain
Langchain langchain
Langchain-ai
Langchain-ai langchain
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title LangGraph Checkpoint affected by RCE in "json" mode of JsonPlusSerializer
Weaknesses CWE-502
References
Metrics cvssV4_0

{'score': 7.4, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Nov 7, 2025, 8:21 PM
Reserved
Nov 3, 2025, 10:12 PM
Status
Deferred
Published
Nov 7, 2025, 9:15 PM
Modified
Jun 17, 2026, 9:54 AM