High 7.4Published Nov 7, 2025

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

Updated under an hour ago (Oct 26, 2026, 2:10 PM ET)

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Every CVE for langchain-ai langgraph

Exploited in the last 30 days

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.

CVSS: 7.4 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-502
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Nov 7, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

langchain-ai langgraph langchain_ai:langgraph (from the name)	before 3.0.0	CNA record

References

References

https://github.com/langchain-ai/langgraph/security/advisories/GHSA-wwqv-p2pp-99h5	x-refsource-confirm
https://github.com/langchain-ai/langgraph/commit/c5744f583b11745cd406f3059903e17bbcdcc8ac	x-refsource-misc
https://github.com/langchain-ai/langgraph/blob/c5744f583b11745cd406f3059903e17bbcdcc8ac/libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py	x-refsource-misc
https://github.com/langchain-ai/langgraph/releases/tag/checkpoint%3D%3D3.0.0	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.