Disclosed vulnerability
CVE-2025-64439: RCE in LangGraph's default checkpoint serializer (JsonPlusSerializer json mode)
AIR-2025-0172 AIR record · 2025-11-langgraph-jsonplusserializer-rce
From the supporting source
LangGraph's `JsonPlusSerializer` (used as the default serialization protocol for all checkpointing) contains a remote code execution (RCE) vulnerability when deserializing payloads saved in the `"json"` serialization mode.github.com
The record
Disclosed
2025-11-05
Vendor
LangChain Inc.
Product
langgraph-checkpoint
Risk domain
Access control and permissions › Privilege escalation
System type
Generative model
Who acted
AI was the target — unsafe deserialization in LangGraph's default checkpoint serializer
Attack surface
Agent memory
Autonomy level
Semi-autonomous
Initial vector
Attacker persisted checkpoint payload
Impact type
Remote code execution
Confidence
High
Submitted by
EAI Internal
Crosswalk
- OWASP Agentic Top 10 (2026)
- ASI03 – Identity and Privilege Abuse
- MITRE ATLAS
- AML.T0055 – Unsecured Credentials
- NIST AI RMF
- GOVERN 6.1
- EU AI Act
- Article 13
- ISO/IEC
- TR 24028; 42001; 23894
- AIUC-1
- B. Security
- Scope
- tool misuse
- Mitigation
- Apply least-privilege principle; Regular policy audits.
- Taxonomy
- Enkrypt AI agent risk taxonomy · Black-Box Red Teaming of Agentic AI: A Taxonomy-Driven Framework for Automated Risk Discovery
Blast radius
all LangGraph deployments using langgraph-checkpoint < 3.0.0 with the json serialization mode
Capability abused
Defense & remediation
Recorded defense
none in json mode
Guardrail kinds
None
Guardrail outcome
Not applicable
Fix shipped
langgraph-checkpoint 3.0.0
Taxonomy & references
Curator notes
GHSA-wwqv-p2pp-99h5, CVSS 7.4 High, published 2025-11-05. Distinct from the June 2026 Check Point checkpointer chain. A later related advisory GHSA-fjqc-hq36-qh5p (CVE-2026-48775, 'Unsafe JSON deserialization in checkpoint loading') covers the same component.
Supporting sources
Cite as
Enkrypt AI. "CVE-2025-64439: RCE in LangGraph's default checkpoint serializer (JsonPlusSerializer json mode)". AIR, AIR-2025-0172. https://agentincident.vercel.app/i/AIR-2025-0172/ (accessed 2026-10-19).