CVE-2025-68664

LangChain is a framework for building agents and LLM-powered applications. Prior to versions 0.3.81 and 1.2.5, a serialization injection vulnerability exists in LangChain's dumps() and dumpd() functions. The functions do not escape dictionaries with 'lc' keys when serializing free-form dictionaries. 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 versions 0.3.81 and 1.2.5.

CVSS v3 9.3 CRITICAL

9.3^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/langchain-ai/langchain/commit/5ec0fa69de31bbe3d76e4cf9cd65a6accb8466c8	Patch
https://github.com/langchain-ai/langchain/commit/d9ec4c5cc78960abd37da79b0250f5642e6f0ce6	Patch
https://github.com/langchain-ai/langchain/pull/34455	Issue Tracking Patch
https://github.com/langchain-ai/langchain/pull/34458	Issue Tracking Patch
https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D0.3.81	Release Notes
https://github.com/langchain-ai/langchain/releases/tag/langchain-core%3D%3D1.2.5	Release Notes
https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm	Exploit Vendor Advisory
https://github.com/langchain-ai/langchain/security/advisories/GHSA-c67j-w6g6-q2cm	Exploit Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:langchain:langchain_core::::::python::*
	cpe:2.3:a:langchain:langchain_core::::::python::*

History

No history.

Information

Published : 2025-12-23 23:15

Updated : 2026-01-13 15:58

NVD link : CVE-2025-68664

Mitre link : CVE-2025-68664

CVE.ORG link : CVE-2025-68664

JSON object : View

Products Affected

langchain

langchain_core

CWE

CWE-502

Deserialization of Untrusted Data

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