LangGraph SQLite Checkpoint — Deserialization (CVE-2026-28277)
Date: 2026-03
Affected: langchain/langgraph
Attack vector: deserialization
Category: vulnerability-disclosure
Severity: Medium
CVE: CVE-2026-28277
CWE: CWE-502
CVSS: 6.8 (CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)

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.


Mitigations:

Architectural layers (MAESTRO):