What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.4 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-07 · updated 2026-06-17
• Weakness: CWE-502

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 products

• langchain-ai langgraph: before 3.0.0

References

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

Get alerted when CVE-2025-64439 or the next vulnerability affects your stack