CVE-2026-28277 LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading
Attackers with write access to the checkpoint database can execute arbitrary code via unsafe msgpack deserialization in LangGraph.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-28277?
CVE-2026-28277 is a medium-severity unsafe deserialization vulnerability in langchain-ai langgraph, published on 5 Mar 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-28277?
3 open source packages ship an affected version, including langgraph. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
langgraph PyPI | All versions | 1.0.10 |
langgraph PyPI | All versions | 1.0.10 |
langgraph PyPI | All versions | 1.0.10rc1 |
Products include Langchain Langgraph.
How do I fix CVE-2026-28277?
Upgrade langgraph to a fixed version for your release line: 1.0.10 or 1.0.10rc1.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-28277 being exploited?
There is no known exploitation of CVE-2026-28277 in the wild and no public exploit code.
Sources
Also known as ECHO-3081-02d6-65ad, GHSA-g48c-2wqr-h844, PYSEC-2026-83.