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CVE-2026-76098— Mistune has Denial of Service — RecursionError via Excessive Emphasis Markers in Markdown

Quick assessment

Affected
lepture mistune
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.

lepture mistune是lepture个人开发者的一款数据库系统。 lepture mistune 3.3.0版本至3.3.2版本存在资源管理错误漏洞，该漏洞源于深度嵌套令牌处理不当，可能导致特制Markdown引发递归错误，造成解析进程崩溃。

CVSS 7.5 · High EPSS 0.49% · P41

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
lepture mistune >= 3.3.0, < 3.3.3 affected
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I. Basic Information for CVE-2026-76098

Vulnerability Information
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Vulnerability Title
Mistune has Denial of Service — RecursionError via Excessive Emphasis Markers in Markdown
Source: CVE Program / CVE List V5
Vulnerability Description
Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.render_token() can exceed Python's recursion limit and raise RecursionError, allowing crafted Markdown to crash a parsing process. This issue is fixed in version 3.3.3
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
lepture mistune 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
lepture mistune是lepture个人开发者的一款数据库系统。 lepture mistune 3.3.0版本至3.3.2版本存在资源管理错误漏洞，该漏洞源于深度嵌套令牌处理不当，可能导致特制Markdown引发递归错误，造成解析进程崩溃。
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

Vendor Product Affected Versions CPE Subscribe
lepture mistune >= 3.3.0, < 3.3.3 -

II. Public POCs for CVE-2026-76098

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Success marker: VULNERABLE: RecursionError raised while HTML-rendering 1000-char nested-strong payload; exfiltrated token: PROOF_cf43d49ceb5be824
Reproduction recording is a Pro+ exclusive
Watch the full sandbox build + live exploit recording for this CVE. Limited-time ¥499/mo.
Upgrade to Pro+
claude_code · 5393 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Trigger conditions & impact
Full executable POC code
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POC zip download
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III. Intelligence Information for CVE-2026-76098

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Patches & Fixes for CVE-2026-76098 (1)

Vendor Advisories for CVE-2026-76098 (1)

IV. Related Vulnerabilities

Same product: mistune
Same vendor: lepture
Same weakness: CWE-674

V. Comments for CVE-2026-76098

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