How severe is CVE-2025-64439?

CVE-2025-64439 has a CVSS 4.0 base score of 7.4, rated high severity.

Is CVE-2025-64439 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-64439?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-64439 have an EU (EUVD) identifier?

Yes. CVE-2025-64439 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37934.

When was CVE-2025-64439 published?

CVE-2025-64439 was published on 2025-11-07 and last updated on 2026-06-17.

CVE-2025-64439

CVE-2025-64439 is a high-severity vulnerability with a CVSS 4.0 base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 4.0 base score 7.4)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-37934
Weakness: CWE-502
Published: 2025-11-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-64439?: 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.
How severe is CVE-2025-64439?: CVE-2025-64439 has a CVSS 4.0 base score of 7.4, rated high severity.
Is CVE-2025-64439 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-64439?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-64439 have an EU (EUVD) identifier?: Yes. CVE-2025-64439 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-37934.
When was CVE-2025-64439 published?: CVE-2025-64439 was published on 2025-11-07 and last updated on 2026-06-17.

References

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