CVE-2025-68664 – LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs

CVE ID : CVE-2025-68664

Published : Dec. 23, 2025, 11:15 p.m. | 5 hours, 5 minutes ago

Description : 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.

Severity: 9.3 | CRITICAL

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