# CVE-2026-48775: LangGraph Checkpoint: Unsafe JSON deserialization in checkpoint loading

> CVE-2026-48775: LangGraph Checkpoint: Unsafe JSON deserialization in checkpoint loading. CVSS 6.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-48775
Last updated: 2026-06-24T18:53:55Z

- Published: 2026-06-16 17:53 UTC · Updated: 2026-06-24 18:53 UTC · Assigner: GitHub\_M
- CVSS: 6.8 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS: 0.23%, 14th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-502, CWE-913

## Description

LangGraph SQLite Checkpoint is an implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via aiosqlite). In versions 4.1.0 and prior, the JsonPlusSerializer can reconstruct Python objects from JSON checkpoint payloads. Under conditions where someone could modify checkpoint bytes at rest in the backing store, the deserialization path could reconstruct objects beyond what the application expects, which could in turn result in code execution at checkpoint load time. This is a defense-in-depth issue. The affected behavior is reachable only when checkpoint bytes at rest in the backing store can be modified by an unauthorized party. In most deployments that prerequisite already implies a serious incident; the additional concern is turning "checkpoint-store write access" into code execution in the application runtime. This issue has been fixed in version 4.1.1.

## Affected vendors and products

- langchain-ai: langgraph
- langchain-ai: langraph-checkpoint

## Tracked companies

- [LangChain (LangSmith)](https://rewindex.com/company/langchain-langsmith.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-48775)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-48775)
- [https://github.com/langchain-ai/langgraph/security/advisories/GHSA-fjqc-hq36-qh5p](https://github.com/langchain-ai/langgraph/security/advisories/GHSA-fjqc-hq36-qh5p)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-48775 · Markdown: https://rewindex.com/cve/CVE-2026-48775.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-48775 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:14:37.853Z