CVE-2026-28277

LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading

Published Mar 5, 2026 CVSS 3.1 · 6.8 Medium EPSS 5.5% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-g48c-2wqr-h844 LangGraph checkpoint loading has unsafe msgpack deserialization
History
Type Values Removed Values Added
First Time appeared Langchain
Langchain langgraph
CPEs cpe:2.3:a:langchain:langgraph:*:*:*:*:*:*:*:*
Vendors & Products Langchain
Langchain langgraph
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Langchain-ai
Langchain-ai langgraph
Vendors & Products Langchain-ai
Langchain-ai langgraph
Type Values Removed Values Added
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.
Title LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading
Weaknesses CWE-502
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Mar 6, 2026, 6:04 PM
Reserved
Feb 26, 2026, 1:52 AM
Status
Analyzed
Published
Mar 5, 2026, 8:16 PM
Modified
Jun 17, 2026, 10:28 AM