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BREW-gptline-CVE-2026-28350 — lxml-html-clean has tag injection through default Cleaner configuration

Affected: Homebrew: gptline

### Summary The `<base>` tag passes through the default `Cleaner` configuration. While `page_structure=True` removes `html`, `head`, and `title` tags, there is no specific handling for `<base>`, allowing an attacker to inject it and hijack relative links on the page.

### Details The `<base>` tag is not currently in the `page_structure` kill set. Even though the specification says `<base>` must be inside `<head>`, browsers accept `<base>` tags outside of the head.

If an attacker injects a `<base>` tag, it changes the base URL for all relative URLs on the page (links, images, scripts) to a domain controlled by the attacker.

### PoC ```python from lxml_html_clean import clean_html

# The base tag is preserved in the output result = clean_html('<base href="http://evil.com/"><a href="/account">Account</a>') print(result) # Output: <div><base href="http://evil.com/">...<a href="/account">Account</a></div> ```

### Impact The injection of a `<base>` tag allows an attacker to hijack the resolution of **all** relative URLs on the page. This results in three critical attack vectors:

1. **Phishing & Redirection:** Attackers can redirect user navigation (e.g., `<a href="/login">`) and form submissions (e.g., `<form action="/auth">`) to an attacker-controlled domain, effectively stealing credentials or sensitive data without the user realizing they have left the legitimate site. 2. **Cross-Site Scripting (XSS):** If the victim application loads JavaScript files using relative paths…

CVE-2026-28350 — lxml_html_clean: tag injection through default Cleaner configuration

Affected: fedora-python lxml_html_clean

lxml_html_clean is a project for HTML cleaning functionalities copied from `lxml.html.clean`. Prior to version 0.4.4, the <base> tag passes through the default Cleaner configuration. While page_structure=True removes html, head, and title tags, there is no specific handling for <base>, allowing an attacker to inject it and hijack relative links on the page. This issue has been patched in version 0.4.4.

GHSA-xvp8-3mhv-424c — lxml-html-clean has tag injection through default Cleaner configuration

Affected: PyPI: lxml-html-clean

### Details The `<base>` tag is not currently in the `page_structure` kill set. Even though the specification says `<base>` must be inside `<head>`, browsers accept `<base>` tags outside of the head.

If an attacker injects a `<base>` tag, it changes the base URL for all relative URLs on the page (links, images, scripts) to a domain controlled by the attacker.

### PoC ```python from lxml_html_clean import clean_html

### Impact The injection of a `<base>` tag allows an attacker to hijack the resolution of **all** relative URLs on the page. This results in three critical attack vectors: