LangGraph Checkpoint affected by RCE in "json" mode of JsonPlusSerializer
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- Present
- Impact type
- Code execution
- Confidentiality · integrity · availability
- None · High · High
- Fix status
- Fixed
Attack profile from CVSS 4.0 · CNA. 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 versions 2.1.2 and below, the 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. By default, the serializer attempts to use "msgpack" for serialization. However, prior to version 3.0 of the checkpointer library, if illegal Unicode surrogate values caused serialization to fail, it would fall back to using the "json" mode. This issue is fixed in version 3.0.0.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
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 | before 3.0.0 | 3.0.0 | Patch available | CNA |
| — | langgraph-checkpoint (PyPI) | before 3.0.0 | 3.0.0 | Patch available | GHSA-wwqv-p2pp-99h5 |
- langgraph Vendorlangchain-ai Affected before 3.0.0 Fixed in 3.0.0 Patch available CNA
- langgraph-checkpoint (PyPI) Vendor— Affected before 3.0.0 Fixed in 3.0.0 Patch available GHSA-wwqv-p2pp-99h5
Remediation
- Fix · CNA langgraph (langchain-ai) Fixed in 3.0.0
- Fix · GHSA-wwqv-p2pp-99h5 langgraph-checkpoint (PyPI) Fixed in 3.0.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2025-64439
- 2026-10-03 Alias added: GHSA-wwqv-p2pp-99h5
References
Other 5
- https://github.com/langchain-ai/langgraph/security/advisories/GHSA-wwqv-p2pp-99h5
- https://github.com/langchain-ai/langgraph/commit/c5744f583b11745cd406f3059903e17bbcdcc8ac
- https://github.com/langchain-ai/langgraph/blob/c5744f583b11745cd406f3059903e17bbcdcc8ac/libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py
- https://github.com/langchain-ai/langgraph/releases/tag/checkpoint%3D%3D3.0.0
- https://github.com/langchain-ai/langgraph
More langchain-ai vulnerabilities
- TI-2024-31340 langchain_experimental (aka LangChain Experimental) 0.1.17 through 0.3.0 for LangChain… CVSS 3.1CRITICAL 9.8
- TI-2023-20724 An issue in langchain langchain-ai v.0.0.232 and before allows a remote attacker to… CVSS 3.1CRITICAL 9.8
- TI-2023-20706 An issue in LanChain-ai Langchain v.0.0.245 allows a remote attacker to execute arbitrary… CVSS 3.1CRITICAL 9.8
- TI-2023-20166 An issue in Harrison Chase langchain v.0.0.194 and before allows a remote attacker to… CVSS 3.1CRITICAL 9.8
- TI-2023-20136 An issue in LangChain v.0.0.231 allows a remote attacker to execute arbitrary code via the prompt parameter. CVSS 3.1CRITICAL 9.8
- TI-2023-18185 An issue in langchain v.0.0.171 allows a remote attacker to execute arbitrary code via a… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2025-64439 · CVE Program
- CVE-2025-64439 · NVD
- FIRST EPSS
- GHSA-wwqv-p2pp-99h5 · 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