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

Source: https://junglewise.ai/threats/cve-2024-52595-html-cleaner-allows-crafted-scripts-in-special-contexts-like-svg  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2024-11-19  
License: CC BY 4.0 with a link back

CVE-2024-52595 · Severity: low · CVSS 3.1 · Published 2024-11-19

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>`.

Technologies: [lxml_html_clean (PyPI)](https://junglewise.ai/threats/technologies/lxml-html-clean). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2024-52595 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2024-52595 being exploited in the wild.

**How severe is CVE-2024-52595?** Low severity, with a CVSS score of 3.1, published 19 November 2024.

**Which products and versions are affected?** lxml_html_clean (PyPI) ECOSYSTEM:introduced=0,fixed=0.4.0, GIT:introduced=0,fixed=c5d816f86eb3707d72a8ecf5f3823e0daa1b3808|ECOSYSTEM:introduced=0,fixed=0.4.0.

**Is there a fix for CVE-2024-52595?** Yes. lxml_html_clean (PyPI): upgrade to 0.4.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2024-52595?** Check whether you run lxml_html_clean (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- lxml_html_clean (PyPI): upgrade to 0.4.0 or later

  ```sh
  pip install "lxml_html_clean>=0.4.0"
  ```


## Affected products

- lxml_html_clean (PyPI) ECOSYSTEM:introduced=0,fixed=0.4.0, GIT:introduced=0,fixed=c5d816f86eb3707d72a8ecf5f3823e0daa1b3808|ECOSYSTEM:introduced=0,fixed=0.4.0

## Identifiers

- CVE-2024-52595
- GHSA-5jfw-gq64-q45f
- PYSEC-2024-160

## Related threats

- [lxml_html_clean XSS via xlink:href namespaced URL attributes](https://junglewise.ai/threats/cve-2026-49825-lxml-html-clean-xss-via-xlink-href-namespaced-url-attributes)
- [lxml-html-clean has <base> tag injection through default Cleaner configuration](https://junglewise.ai/threats/cve-2026-28350-lxml-html-clean-has-base-tag-injection-through-default-cleaner)
- [lxml-html-clean has CSS @import Filter Bypass via Unicode Escapes](https://junglewise.ai/threats/cve-2026-28348-lxml-html-clean-has-css-import-filter-bypass-via-unicode-escapes)