LangGraph: Unsafe msgpack deserialization in LangGraph checkpoint loading
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-502.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| langchain-ai | langgraph | up to 1.0.9 | — | No fix listed | CNA |
| — | langgraph (PyPI) | before 1.0.10 | 1.0.10 | Patch available | GHSA-g48c-2wqr-h844 |
- langgraph Vendorlangchain-ai Affected up to 1.0.9 Fixed in — No fix listed CNA
- langgraph (PyPI) Vendor— Affected before 1.0.10 Fixed in 1.0.10 Patch available GHSA-g48c-2wqr-h844
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:langchain:langgraph:*:*:*:*:*:*:*:* | up to 1.0.9 | Vulnerable | langchain-ai |
- cpe:2.3:a:langchain:langgraph:*:*:*:*:*:*:*:* Versions up to 1.0.9 Vulnerable ·langchain-ai
Remediation
- Fix · GHSA-g48c-2wqr-h844 langgraph (PyPI) Fixed in 1.0.10 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-28277
- 2026-10-03 Alias added: GHSA-g48c-2wqr-h844
- 2026-10-25 EPSS moved to the 90th–95th percentile
- 2026-10-25 Priority changed: LOW → MEDIUM
References
Sources
- CVE-2026-28277 · CVE Program
- CVE-2026-28277 · NVD
- FIRST EPSS
- GHSA-g48c-2wqr-h844 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences