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CVE-2025-6985— XXE Vulnerability in langchain-ai/langchain

Quick assessment

Affected
langchain-ai langchain-ai/langchain
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

langchain-text-splitters是LangChain开源的一个Python包。 langchain-text-splitters 0.3.8版本存在代码问题漏洞，该漏洞源于HTMLSectionSplitter类允许使用任意XSLT样式表，可能导致XML外部实体攻击，攻击者可读取任意本地文件或执行外部HTTP请求。

AI Predicted 9.8 Difficulty: Trivial EPSS 0.51% · P41
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I. Basic Information for CVE-2025-6985

Vulnerability Information
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Vulnerability Title
XXE Vulnerability in langchain-ai/langchain
Source: CVE Program / CVE List V5
Vulnerability Description
The HTMLSectionSplitter class in langchain-text-splitters version 0.3.8 is vulnerable to XML External Entity (XXE) attacks due to unsafe XSLT parsing. This vulnerability arises because the class allows the use of arbitrary XSLT stylesheets, which are parsed using lxml.etree.parse() and lxml.etree.XSLT() without any hardening measures. In lxml versions up to 4.9.x, external entities are resolved by default, allowing attackers to read arbitrary local files or perform outbound HTTP(S) fetches. In lxml versions 5.0 and above, while entity expansion is disabled, the XSLT document() function can still read any URI unless XSLTAccessControl is applied. This vulnerability allows remote attackers to gain read-only access to any file the LangChain process can reach, including sensitive files such as SSH keys, environment files, source code, or cloud metadata. No authentication, special privileges, or user interaction are required, and the issue is exploitable in default deployments that enable custom XSLT.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5
Vulnerability Title
langchain-text-splitters 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
langchain-text-splitters是LangChain开源的一个Python包。 langchain-text-splitters 0.3.8版本存在代码问题漏洞，该漏洞源于HTMLSectionSplitter类允许使用任意XSLT样式表，可能导致XML外部实体攻击，攻击者可读取任意本地文件或执行外部HTTP请求。
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)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langchain-ai langchain-ai/langchain unspecified ~ latest -

II. Public POCs for CVE-2025-6985

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III. Intelligence Information for CVE-2025-6985

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IV. Related Vulnerabilities

Same product: langchain-ai/langchain
Same vendor: langchain-ai
Same weakness: CWE-611

V. Comments for CVE-2025-6985

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