CVE-2026-28277
LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading
CVSS Score
6.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-502 |
| Vendor | langchain-ai |
| Product | langgraph |
| Published | Mar 5, 2026 |
| Last Updated | Mar 6, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
langchain-ai / langgraph
<= 1.0.9