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CVE-2026-59930— Mistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering with no slugification, allowing collision with attacker-controlled `id="toc_N"` content

CVSS 4.3 · Medium EPSS 0.14% · P4

Possible ATT&CK Techniques 1AI

T1189 · Drive-by Compromise

Affected Version Matrix 1

VendorProductVersion RangeStatus
lepturemistune< 3.3.0affected
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I. Basic Information for CVE-2026-59930

Vulnerability Information
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Vulnerability Title
Mistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering with no slugification, allowing collision with attacker-controlled `id="toc_N"` content
Source: CVE Program / CVE List V5
Vulnerability Description
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the toc plugin and TableOfContents directive generate heading IDs as predictable toc_N values without slugifying the heading text, allowing attacker-controlled id="toc_N" content to collide with generated anchors and redirect same-page navigation, CSS selectors, or JavaScript handlers. 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:R/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
Hsiaoming Yang mistune 输入验证错误漏洞
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之前版本存在输入验证错误漏洞，该漏洞源于toc插件和TableOfContents指令生成可预测的toc_N值作为标题ID，而未对标题文本进行slugify处理，导致攻击者控制的id="toc_N"内容可以与生成的锚点冲突，并重定向同页导航、CSS选择器或JavaScript处理程序。
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-2026-59930

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III. Intelligence Information for CVE-2026-59930

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Vendor Advisories for CVE-2026-59930 (1)

Vendor Pages for CVE-2026-59930 (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-2026-599275.3 MEDIUMMistune directives/include: mutual `.. include::` recursion crashes the renderer with `Rec
CVE-2026-59926Mistune: XSS via unescaped class option in Admonition directive

IV. Related Vulnerabilities

Same product: mistune
Same vendor: lepture
Same weakness: CWE-345

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