Answer in brief
CVE-2026-49825 records a High severity (CVSS 8.2) vulnerability in lxml: javascript: URL bypass in Cleaner via xlink:href. The current sources do not mark it as known exploited. The current feed maps lxml/lxml (generic), fedora-python/lxml_html_clean (generic), lxml_html_clean (pip). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.2. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps lxml/lxml (generic), fedora-python/lxml_html_clean (generic), lxml_html_clean (pip). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| lxml/lxmlgeneric | <6.1.1 | 6.1.1 |
| fedora-python/lxml_html_cleangeneric | <0.4.5 | 0.4.5 |
| lxml_html_cleanpip | <0.4.5 | 0.4.5 |
Published upstream
Aug 20, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 8, 2026
lxml is a library for processing XML and HTML in the Python language. Prior to 6.1.1, link attributes in ``lxml.html.defs.link_attrs`` 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 lxml_html_clean 0.4.5.
Quoted source text, attributed separately from HOL analysis.