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

Quick assessment

Affected
lxml lxml
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 是一个用于在 Python 中处理 XML 和 HTML 的库。在 6.1.1 版本之前， 中的链接属性缺少对 的支持，这可能导致在嵌入的 SVG/MathML 等内容中发生 URL 绕过攻击。该漏洞已在 lxml 6.1.1 和 lxml_html_clean 0.4.5 版本中得到修复。

CVSS 8.2 · High EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
fedora-python lxml_html_clean < 0.4.5 affected
lxml lxml < 6.1.1 affected
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I. Basic Information for CVE-2026-49825

Vulnerability Information
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Vulnerability Title
lxml: javascript: URL bypass in Cleaner via xlink:href
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
lxml lxml < 6.1.1 -
fedora-python lxml_html_clean < 0.4.5 -

II. Public POCs for CVE-2026-49825

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6433 chars
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III. Intelligence Information for CVE-2026-49825

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Patches & Fixes for CVE-2026-49825 (3)

Vendor Advisories for CVE-2026-49825 (1)

Vendor Pages for CVE-2026-49825 (1)

IV. Related Vulnerabilities

Same product: lxml
Same vendor: lxml
Same weakness: CWE-79

V. Comments for CVE-2026-49825

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