CVE-2026-28277

LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading

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

langchain-ai · langgraph

CVSS v3.1 NVD

7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 GITHUB

6.8 MEDIUMCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS

0.70% chance of exploitation in the next 30 days, 52nd percentile

Published

2026-03-05

Updated

2026-03-06

Proof-of-concept exploits (1)

• advisories/GHSA-g48c-2wqr-h844

Security advisories

• langchain-ai/langgraph/security/advisories/GHSA-g48c-2wqr-h844

References

• CVE Record
• NVD entry