# CVE-2026-28277: LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading

> CVE-2026-28277: LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading. CVSS 6.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-28277
Last updated: 2026-06-17T10:28:25Z

- Published: 2026-03-05 19:10 UTC · Updated: 2026-06-17 10:28 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: 4.9%, 92th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-502

## Description

LangGraph SQLite Checkpoint is an implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via aiosqlite). In version 1.0.9 and prior, LangGraph checkpointers can load msgpack-encoded checkpoints that reconstruct Python objects during deserialization. If an attacker can modify checkpoint data in the backing store (for example, after a database compromise or other privileged write access to the persistence layer), they can potentially supply a crafted payload that triggers unsafe object reconstruction when the checkpoint is loaded. No known patch is public.

## Affected vendors and products

- langchain-ai: langgraph

## Tracked companies

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

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-28277)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-28277)
- [https://github.com/langchain-ai/langgraph/security/advisories/GHSA-g48c-2wqr-h844](https://github.com/langchain-ai/langgraph/security/advisories/GHSA-g48c-2wqr-h844)

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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-2026-28277 · Markdown: https://rewindex.com/cve/CVE-2026-28277.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-28277 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:52.124Z