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CVE-2026-41066— lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files

Quick assessment

Affected
lxml lxml
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.

lxml是lxml个人开发者的一个可与Python交互用于定位Html中元素的软件。 lxml 6.1.0之前版本存在代码问题漏洞，该漏洞源于默认配置下解析器允许不受信任的XML输入读取本地文件。

CVSS 7.5 · High EPSS 0.32% · P26

Possible ATT&CK Techniques 1 AI

T1123 · Audio Capture
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I. Basic Information for CVE-2026-41066

Vulnerability Information
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Vulnerability Title
lxml: Default configuration of iterparse() and ETCompatXMLParser() allows XXE to local files
Source: CVE Program / CVE List V5
Vulnerability Description
lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.0, using either of the two parsers in the default configuration (with resolve_entities=True) allows untrusted XML input to read local files. Setting the resolve_entities option explicitly to resolve_entities='internal' or resolve_entities=False disables the local file access. This vulnerability is fixed in 6.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
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
lxml 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lxml是lxml个人开发者的一个可与Python交互用于定位Html中元素的软件。 lxml 6.1.0之前版本存在代码问题漏洞，该漏洞源于默认配置下解析器允许不受信任的XML输入读取本地文件。
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
lxml lxml < 6.1.0 -

II. Public POCs for CVE-2026-41066

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III. Intelligence Information for CVE-2026-41066

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Vendor Advisories for CVE-2026-41066 (2)

IV. Related Vulnerabilities

Same product: lxml
Same vendor: lxml
Same weakness: CWE-611