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
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Thu, 25 Dec 2025 00:15:00 +0000
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threat_severity
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threat_severity
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Wed, 24 Dec 2025 15:15:00 +0000
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Wed, 24 Dec 2025 12:00:00 +0000
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Langchain-ai
Langchain-ai langchainjs |
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Langchain-ai
Langchain-ai langchainjs |
Tue, 23 Dec 2025 23:15:00 +0000
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| 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 | |
| Title | LangChain serialization injection vulnerability enables secret extraction | |
| Weaknesses | CWE-502 | |
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cvssV3_1
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2025-12-23T22:56:04.837Z
Updated: 2025-12-24T14:38:40.268Z
Reserved: 2025-12-22T23:28:02.917Z
Link: CVE-2025-68665
Updated: 2025-12-24T14:38:27.420Z
Status : Received
Published: 2025-12-23T23:15:45.097
Modified: 2025-12-24T15:16:02.797
Link: CVE-2025-68665