CVE-2025-68665
8.6 · HIGHOverview
CVE-2025-68665 is a high-severity vulnerability affecting langchain langchain.js. It was published on December 23, 2025 and has a CVSS 3.1 base score of 8.6 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
LangChain is a framework for building LLM-powered applications. Prior to @langchain/core versions 0.3.80 and 1.1.8, and prior to langchain versions 0.3.37 and 1.2.3, a serialization injection vulnerability exists in LangChain JS's toJSON() method (and subsequently when string-ifying objects using JSON.stringify(). The method did not escape objects with 'lc' keys when serializing free-form data in kwargs. The 'lc' key is used internally by LangChain to mark serialized objects. When user-controlled data contains this key structure, it is treated as a legitimate LangChain object during deserialization rather than plain user data. This issue has been patched in @langchain/core versions 0.3.80 and 1.1.8, and langchain versions 0.3.37 and 1.2.3
Remediation
Check the references section for vendor advisories and patches from langchain. Update langchain.js to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| langchain | langchain.js | >= 0, < 0.3.37 | Affected |
| langchain | langchain\/core | >= 0, < 0.3.80 | Affected |
References
Frequently Asked Questions
What is CVE-2025-68665?
CVE-2025-68665 is a high-severity vulnerability affecting langchain langchain.js. It was published on December 23, 2025 and has a CVSS 3.1 base score of 8.6 (HIGH).
How severe is CVE-2025-68665?
This vulnerability has a CVSS 3.1 base score of 8.6, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2025-68665?
Check the references section for vendor advisories and patches from langchain. Update langchain.js to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-68665?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-68665 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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