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CVE-2024-52595— HTML Cleaner allows crafted scripts in special contexts like svg or math to pass through

Quick assessment

Affected
fedora-python lxml_html_clean
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.

lxml_html_clean是Fedora Python SIG开源的一个从 lxml.HTML.clean 复制的 HTML 清理功能的单独项目。 lxml_html_clean 0.4.0之前版本存在安全漏洞，该漏洞源于特殊标签处理不当，容易受到跨站脚本攻击。

CVSS 7.7 · High EPSS 0.51% · P43
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I. Basic Information for CVE-2024-52595

Vulnerability Information
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Vulnerability Title
HTML Cleaner allows crafted scripts in special contexts like svg or math to pass through
Source: CVE Program / CVE List V5
Vulnerability Description
lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.0, the HTML Parser in lxml does not properly handle context-switching for special HTML tags such as `<svg>`, `<math>` and `<noscript>`. This behavior deviates from how web browsers parse and interpret such tags. Specifically, content in CSS comments is ignored by lxml_html_clean but may be interpreted differently by web browsers, enabling malicious scripts to bypass the cleaning process. This vulnerability could lead to Cross-Site Scripting (XSS) attacks, compromising the security of users relying on lxml_html_clean in default configuration for sanitizing untrusted HTML content. Users employing the HTML cleaner in a security-sensitive context should upgrade to lxml 0.4.0, which addresses this issue. As a temporary mitigation, users can configure lxml_html_clean with the following settings to prevent the exploitation of this vulnerability. Via `remove_tags`, one may specify tags to remove - their content is moved to their parents' tags. Via `kill_tags`, one may specify tags to be removed completely. Via `allow_tags`, one may restrict the set of permissible tags, excluding context-switching tags like `<svg>`, `<math>` and `<noscript>`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
lxml_html_clean 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lxml_html_clean是Fedora Python SIG开源的一个从 lxml.HTML.clean 复制的 HTML 清理功能的单独项目。 lxml_html_clean 0.4.0之前版本存在安全漏洞，该漏洞源于特殊标签处理不当，容易受到跨站脚本攻击。
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
fedora-python lxml_html_clean < 0.4.0 -

II. Public POCs for CVE-2024-52595

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6346 chars
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III. Intelligence Information for CVE-2024-52595

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Patches & Fixes for CVE-2024-52595 (1)

Vendor Advisories for CVE-2024-52595 (1)

IV. Related Vulnerabilities

Same product: lxml_html_clean
Same vendor: fedora-python
Same weakness: CWE-79