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CVE-2026-44896— Mistune: XSS via unescaped figclass/figwidth in Figure directive

AI Predicted 6.1 Difficulty: Moderate EPSS 0.05% · P15

Possible ATT&CK Techniques 1AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 1

VendorProductVersion RangeStatus
lepturemistune<= 3.2.0affected
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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: NVD (National Vulnerability Database)
Vulnerability Description
Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and realier, 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
lepturemistune <= 3.2.0 -

II. Public POCs for CVE-2026-44896

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III. Intelligence Information for CVE-2026-44896

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Vendor Advisories for CVE-2026-44896 (1)

Same Patch Batch · lepture · 2026-05-26 · 5 CVEs total

CVE-2026-448986.1 MEDIUMMistune TOC Anchor Injection XSS
CVE-2026-448976.1 MEDIUMMistune Heading ID Attribute Injection XSS
CVE-2026-447086.1 MEDIUMMistune Math Plugin XSS Escape Bypass
CVE-2026-448994.7 MEDIUMMistune Image Directive CSS Injection Vulnerability

IV. Related Vulnerabilities

Same product: mistune
Same vendor: lepture
Same weakness: CWE-79

V. Comments for CVE-2026-44896

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