CVE-2026-44896— Mistune: XSS via unescaped figclass/figwidth in Figure directive
Possible ATT&CK Techniques 1AI
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I. Basic Information for CVE-2026-44896
Vulnerability Information
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Vulnerability Title
Mistune: XSS via unescaped figclass/figwidth in Figure directive
Source: CVE Program / CVE List V5
Vulnerability Description
Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and earlier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when HTMLRenderer(escape=True) is used, because these values bypass the inline renderer. Version 3.2.1 contains a patch.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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
Vulnerability Title
mistune 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mistune是Hsiaoming Yang个人开发者的一个快速而强大的 Python Markdown 解析器。 mistune 3.2.0及之前版本存在跨站脚本漏洞，该漏洞源于在src/mistune/directives/image.py中，render_figure()函数将figclass和figwidth选项直接拼接至HTML属性而未进行转义，即使HTMLRenderer(escape=True)启用时也可导致属性注入和跨站脚本攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-44896
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Patches & Fixes for CVE-2026-44896 (1)
- 🔗 fix: escape html text · lepture/mistune@a3cb6e5 · GitHubx_refsource_MISC
Vendor Advisories for CVE-2026-44896 (1)
Same Patch Batch · lepture · 2026-05-26 · 5 CVEs total
| CVE-2026-44898 | 6.1 MEDIUM | Mistune TOC Anchor Injection XSS |
| CVE-2026-44897 | 6.1 MEDIUM | Mistune Heading ID Attribute Injection XSS |
| CVE-2026-44708 | 6.1 MEDIUM | Mistune Math Plugin XSS Escape Bypass |
| CVE-2026-44899 | 4.7 MEDIUM | Mistune Image Directive CSS Injection Vulnerability |
IV. Related Vulnerabilities
Same product: mistune
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inline_parser: quadratic-time parsing on long runs of `**x**
Same vendor: lepture
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Mistune directives/include: mutual `.. include::` recursion - CVE-2026-59928
Mistune block_parser: quadratic-time parsing on long lists o - CVE-2026-59924
Mistune: Arbitrary File Read via Include directive path trav - CVE-2026-59929
Mistune renderers/html.safe_url: HARMFUL_PROTOCOLS list miss - CVE-2026-59925
inline_parser: quadratic-time parsing on long runs of `**x**
Same weakness: CWE-79
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V. Comments for CVE-2026-44896
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