CVE-2025-64439: PYSEC-2026-1527 - LangGraph Checkpoint affected by RCE in "json" mode of JsonPlusSerializer

CVE-2025-64439 · Severity: medium · CVSS 4 · Published 2026-07-07

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

Technologies: langgraph-checkpoint (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2025-64439 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-64439 being exploited in the wild.
How severe is CVE-2025-64439?
Medium severity, with a CVSS score of 4, published 7 July 2026.
Which products and versions are affected?
langgraph-checkpoint (PyPI) ECOSYSTEM:introduced=0,fixed=3.0.0.
Is there a fix for CVE-2025-64439?
Yes. langgraph-checkpoint (PyPI): upgrade to 3.0.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2025-64439?
Check whether you run langgraph-checkpoint (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • langgraph-checkpoint (PyPI): upgrade to 3.0.0 or later
    pip install "langgraph-checkpoint>=3.0.0"

Affected products

  • langgraph-checkpoint (PyPI) ECOSYSTEM:introduced=0,fixed=3.0.0

Identifiers

  • CVE-2025-64439
  • GHSA-wwqv-p2pp-99h5
  • PYSEC-2026-1527

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