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CVE-2025-68665

8.6 · HIGH

LangChain is a framework for building LLM-powered applications.

Published Dec 23, 2025CWE-502EPSS 0.79%

Overview

CVE-2025-68665 is a high-severity vulnerability. 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, patches, and mitigation guidance. 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.

References

GitHubgithub.com/langchain-ai/langchainjs/commit/e5063f9c6e9989ea067dfdff39262b9e7b6aba62GitHubgithub.com/langchain-ai/langchainjs/releases/tag/%40langchain%2Fcore%401.1.8GitHubgithub.com/langchain-ai/langchainjs/releases/tag/langchain%401.2.3GitHubgithub.com/langchain-ai/langchainjs/security/advisories/GHSA-r399-636x-v7f6GitHubgithub.com/langchain-ai/langchainjs/security/advisories/GHSA-r399-636x-v7f6

How CyberStrike helps

Frequently asked questions

What is CVE-2025-68665?

CVE-2025-68665 is a high-severity vulnerability. 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, patches, and mitigation guidance. 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 is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-68665 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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