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CVE-2026-59927— Mistune directives/include: mutual `.. include::` recursion crashes the renderer with `RecursionError`, denial of service via two attacker-controlled markdown files

CVSS 5.3 · Medium EPSS 0.35% · P28

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProductVersion RangeStatus
lepturemistune< 3.3.0affected
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I. Basic Information for CVE-2026-59927

Vulnerability Information
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Vulnerability Title
Mistune directives/include: mutual `.. include::` recursion crashes the renderer with `RecursionError`, denial of service via two attacker-controlled markdown files
Source: CVE Program / CVE List V5
Vulnerability Description
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the Include directive in src/mistune/directives/include.py detects only direct self-includes and not indirect cycles, allowing two markdown files that include each other to trigger unbounded recursion, raise RecursionError, and crash the rendering request. This issue is fixed in version 3.3.0.
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:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5
Vulnerability Title
Hsiaoming Yang mistune 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Hsiaoming Yang mistune是日本Hsiaoming Yang个人开发者的一个快速、可扩展的Markdown解析器。 Hsiaoming Yang mistune 3.3.0之前版本存在安全漏洞，该漏洞源于Include指令仅检测直接自身包含而无法检测间接循环，可能导致相互包含的两个markdown文件触发无限递归，引发RecursionError并导致渲染请求崩溃。
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

VendorProductAffected VersionsCPESubscribe
lepturemistune < 3.3.0 -

II. Public POCs for CVE-2026-59927

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III. Intelligence Information for CVE-2026-59927

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Patches & Fixes for CVE-2026-59927 (1)

Vendor Advisories for CVE-2026-59927 (1)

Vendor Pages for CVE-2026-59927 (1)

Same Patch Batch · lepture · 2026-07-08 · 9 CVEs total

CVE-2026-599227.5 HIGHMistune plugins/formatting: quadratic-time parsing on long runs of `~~x~~`, `==x==`, and `
CVE-2026-599257.5 HIGHinline_parser: quadratic-time parsing on long runs of `**x**` and `***x***` emphasis pairs
CVE-2026-599287.5 HIGHMistune block_parser: quadratic-time parsing on long lists of repeated reference-link defi
CVE-2026-599236.1 MEDIUMMistune: XSS via percent-encoded javascript URI bypass in safe_url()
CVE-2026-599296.1 MEDIUMMistune renderers/html.safe_url: HARMFUL_PROTOCOLS list misses legacy and chained schemes
CVE-2026-599245.9 MEDIUMMistune: Arbitrary File Read via Include directive path traversal
CVE-2026-599304.3 MEDIUMMistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering wit
CVE-2026-59926Mistune: XSS via unescaped class option in Admonition directive

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-59927

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