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

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0089, the 59th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 5 Nov 2025. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-wwqv-p2pp-99h5
• OSV: GHSA-wwqv-p2pp-99h5
• github.com/langchain-ai/langgraph/security/advisories/GHSA-wwqv-p2pp-99h5
• nvd.nist.gov/vuln/detail/CVE-2025-64439
• github.com/langchain-ai/langgraph/commit/c5744f583b11745cd406f3059903e17bbcdcc8ac
• github.com/langchain-ai/langgraph
• github.com/langchain-ai/langgraph/blob/c5744f583b11745cd406f3059903e17bbcdcc8ac/libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py
• github.com/langchain-ai/langgraph/releases/tag/checkpoint%3D%3D3.0.0

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.