CVE-2025-6985

描述

The HTMLSectionSplitter class in langchain-text-splitters 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.

如何修補 CVE-2025-6985

要修補 CVE-2025-6985,請將受影響套件升級到下列已修補版本。

• —升級至 0.3.9 或更新版本

CVE-2025-6985 正在被利用嗎?

低 — EPSS 為 0.1%,目前沒有觀察到大規模利用活動。

受影響套件(1)

• from 0, < 0.3.9

CVSS 分數

參考連結(5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2025-6985
• PATCHgithub.com/langchain-ai/langchain
• WEBgithub.com/langchain-ai/langchain/commit/43eef435505a1c907227b724c0c760ad5fc01790
• WEBgithub.com/langchain-ai/langchain/pull/31819