CVE-2025-644397.4HighCWE-502

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

langchain-ai · langgraph

Affected: langchain-ai langgraph · Exploitation: unlikely (under 1%)

Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.

0.9%probability of exploitation in the next 30 days

59th percentile

050100

Higher than 59% of scored CVEs

7.4HighCVSS 4.0

LowMediumHighCrit.

DescriptionCVE.org

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 products1

From the CVE record. A product or version that is not listed is unknown, not unaffected.

langchain-ai · langgraph< 3.0.0

On the Atlas

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Open the Atlas

Exploitation: Unlikely (under 1%). EPSS under 1%, or no score yet.
CISA KEV: Not listed
Public check: No public nuclei template
Weakness: Deserialization of Untrusted Data · Deserialization and Object Injection
Vendor: langchain-ai
Published: November 2025
Band: Unlikely (under 1%), November 2025

CoverageNo articles yet

No CyberSIXT article names CVE-2025-64439 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.