What's the vulnerability?

Constructor deserialization vulnerability in langgraph-checkpoint's JsonPlusSerializer allows RCE when attacker can persist untrusted data into checkpoints

Root Cause Analysis
One Command

Verify with pruva-verify

Run the Pruva CLI to automatically fetch and execute the reproduction script.

pruva-verify REPRO-2026-00062
or pruva-verify GHSA-wwqv-p2pp-99h5
or pruva-verify CVE-2025-64439
Install: curl -fsSL https://pruva.dev/install.sh | sh

Or Run Manually

1

Download the script

curl -O https://pruva.dev/api/v1/reproductions/REPRO-2026-00062/artifacts/repro/reproduction_steps.sh
2

Make executable

chmod +x reproduction_steps.sh
3

Run the script

./reproduction_steps.sh
Run in a VM, container, or disposable environment. This exploits a real vulnerability.

How Pruva Reproduced This

Watch the AI agent's step-by-step process.

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