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

Quick assessment

Affected
langchain-ai langchain
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

LangChain是LangChain开源的一个用于开发由大型语言模型 （LLM） 提供支持的应用程序的框架。 LangChain 0.3.81之前版本和1.2.5之前版本存在代码问题漏洞，该漏洞源于序列化注入，可能导致反序列化时执行任意代码。

CVSS 9.3 · Critical EPSS 43.41% · P99

Public Exploits 1

ExploitDB · 1 EDB-52514 [webapps]

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-68664

Vulnerability Information
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Vulnerability Title
LangChain serialization injection vulnerability enables secret extraction in dumps/loads APIs
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
LangChain 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
LangChain是LangChain开源的一个用于开发由大型语言模型 （LLM） 提供支持的应用程序的框架。 LangChain 0.3.81之前版本和1.2.5之前版本存在代码问题漏洞，该漏洞源于序列化注入，可能导致反序列化时执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langchain >= 1.0.0, < 1.2.5 -

II. Public POCs for CVE-2025-68664

# POC Description Source Link Shenlong Link
1 A testing framework to identify and demonstrate deserialization vulnerabilities in LangChain Core (<0.3.81). Educational use only https://github.com/Ak-cybe/CVE-2025-68664-LangGrinch-PoC POC Details
2 None https://github.com/comerc/CVE-2025-68664 POC Details
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Qwen3.6-35B-A3B · 7885 chars
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III. Intelligence Information for CVE-2025-68664

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Patches & Fixes for CVE-2025-68664 (4)

Vendor Advisories for CVE-2025-68664 (1)

Other References for CVE-2025-68664 (2)

IV. Related Vulnerabilities

Same product: langchain
Same vendor: langchain-ai
Same weakness: CWE-502

V. Comments for CVE-2025-68664

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