CVE-2026-49825

lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in lxml.html.defs.linkattrs were missing xlink:href, which can be used for URL bypass attacks in embedded SVG/MathML/etc. content. This vulnerability was fixed in lxml 6.1.1 and lxmlhtmlclean 0.4...

CVE-2026-49825 lxml: javascript: URL bypass in Cleaner via xlink:href

lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in lxml.html.defs.linkattrs were missing xlink:href, which can be used for URL bypass attacks in embedded SVG/MathML/etc. content. This vulnerability was fixed in lxml 6.1.1 and lxmlhtmlclean 0.4...

CVE-2026-49825

lxml_html_clean.Cleaner fails to strip javascript: URLs from namespaced xlink:href attributes in SVG/MathML content because lxml.html.defs.link_attrs omits that key, so the URL-scheme filter never fires. Exploitable only with safe_attrs_only=False; affects lxml ≤ 6.1.0 and lxml_html_clean ≤ 0.4.4...

PYSEC-2026-2614 `lxml_html_clean.Cleaner` does not strip `javascript:` URLs from namespaced URL attributes

lxmlhtmlclean.Cleaner does not strip javascript: URLs from namespaced URL attributes xlink:href Reporter: Guillem Lefait · Date: 2026-05-10 Affected: lxml ≤ 6.1.0 and lxmlhtmlclean ≤ 0.4.4 latest stable Confirmed against: lxml 6.1.0 + lxmlhtmlclean 0.4.4 on Python 3.13.5, 3.14.4, and 3.15.0a8...

`lxml_html_clean.Cleaner` does not strip `javascript:` URLs from namespaced URL attributes

lxmlhtmlclean.Cleaner does not strip javascript: URLs from namespaced URL attributes xlink:href Reporter: Guillem Lefait · Date: 2026-05-10 Affected: lxml ≤ 6.1.0 and lxmlhtmlclean ≤ 0.4.4 latest stable Confirmed against: lxml 6.1.0 + lxmlhtmlclean 0.4.4 on Python 3.13.5, 3.14.4, and 3.15.0a8...

The vulnerability of the _has_sneaky_javascript() function in the lxml_html_clean library for the Python programming language allows attackers to perform cross-site scripting (XSS) attacks.

The vulnerability of the hassneakyjavascript function in the lxmlhtmlclean library, written in the Python programming language, is related to incorrect encoding or escaping of output data. Exploiting this vulnerability allows a malicious actor to perform cross-site scripting XSS attacks remotely...

UBUNTU-CVE-2026-28348

lxmlhtmlclean is a project for HTML cleaning functionalities copied from lxml.html.clean. Prior to version 0.4.4, the hassneakyjavascript method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression filters,...

CVE-2026-28350 lxml_html_clean: <base> tag injection through default Cleaner configuration

lxmlhtmlclean is a project for HTML cleaning functionalities copied from lxml.html.clean. Prior to version 0.4.4, the tag passes through the default Cleaner configuration. While pagestructure=True removes html, head, and title tags, there is no specific handling for , allowing an attacker to inje...

CVE-2026-28348

lxmlhtmlclean is a project for HTML cleaning functionalities copied from lxml.html.clean. Prior to version 0.4.4, the hassneakyjavascript method strips backslashes before checking for dangerous CSS keywords. This causes CSS Unicode escape sequences to bypass the @import and expression filters,...

lxml_html_clean 安全漏洞

lxmlhtmlclean is a separate project derived from lxml.HTML.clean, open sourced by the Fedora Python SIG. Versions of lxmlhtmlclean prior to 0.4.4 contained security vulnerabilities. These vulnerabilities stemmed from the base tag being used with the default Cleaner configuration, which could allo...

lxml_html_clean 安全漏洞

lxmlhtmlclean is a separate project derived from lxml.HTML.clean, open sourced by the Fedora Python SIG. Versions of lxmlhtmlclean prior to 0.4.4 contained security vulnerabilities. These vulnerabilities stemmed from the hassneakyjavascript method, which strips backslashes before checking for...

Cross-site Scripting (XSS)

lxmlhtmlclean is vulnerable to Cross-Site Scripting XSS. The vulnerability is due to improper handling of context-switching for special HTML tags such as , , and by the HTML parser in versions prior to 0.4.0, allowing malicious scripts to bypass the cleaning process...

SUSE CVE-2024-52595

lxmlhtmlclean 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 , and . This behavior deviates from how web browsers parse and interpret such tags...

CVE-2024-52595

lxmlhtmlclean 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 , and . This behavior deviates from how web browsers parse and interpret such tags...

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

lxmlhtmlclean 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 , and . This behavior deviates from how web browsers parse and interpret such tags...

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

lxmlhtmlclean 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 , and . This behavior deviates from how web browsers parse and interpret such tags...