Bug 2424797 (CVE-2025-68665)

Summary: CVE-2025-68665 langchain-core: LangChain: Arbitrary Code Execution via Serialization Injection
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: anpicker, bparees, carogers, dfreiber, drow, erezende, haoli, hasun, hkataria, jajackso, jburrell, jcammara, jfula, jkoehler, jmitchel, jneedle, jowilson, jwong, kegrant, koliveir, kshier, lphiri, mabashia, nyancey, omaciel, ometelka, pbraun, ptisnovs, shvarugh, simaishi, smcdonal, stcannon, syedriko, teagle, tfister, thavo, ttakamiy, vkumar, xdharmai, yguenane
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in LangChain. A remote attacker could exploit a serialization injection vulnerability in the `toJSON()` method. This occurs because the method fails to properly escape objects containing 'lc' keys during serialization of free-form data. When user-controlled data includes this key structure, it is incorrectly processed as a legitimate LangChain object during deserialization, which could lead to arbitrary code execution.
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Description OSIDB Bzimport 2025-12-24 00:01:12 UTC 
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