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CVE-2026-59929— Mistune renderers/html.safe_url: HARMFUL_PROTOCOLS list misses legacy and chained schemes that historically chain to `javascript:` execution

CVSS 6.1 · Medium EPSS 0.22% · P13

Possible ATT&CK Techniques 1AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProductVersion RangeStatus
lepturemistune< 3.3.0affected
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I. Basic Information for CVE-2026-59929

Vulnerability Information
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Vulnerability Title
Mistune renderers/html.safe_url: HARMFUL_PROTOCOLS list misses legacy and chained schemes that historically chain to `javascript:` execution
Source: CVE Program / CVE List V5
Vulnerability Description
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in src/mistune/renderers/html.py blocks only javascript:, vbscript:, file:, and data: schemes, allowing legacy or chained schemes such as feed:, view-source:, jar:, livescript:, mocha:, ms-its:, mk:, and res: to reach rendered href and src attributes and potentially execute script in affected user agents. 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:C/C:L/I:L/A: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
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之前版本存在安全漏洞，该漏洞源于safe_url过滤器仅拦截特定协议，允许遗留或链式协议，可能导致受影响用户执行脚本。
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-2026-59929

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III. Intelligence Information for CVE-2026-59929

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Patches & Fixes for CVE-2026-59929 (1)

Vendor Advisories for CVE-2026-59929 (1)

Vendor Pages for CVE-2026-59929 (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-2026-599245.9 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-2026-599304.3 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-79

V. Comments for CVE-2026-59929

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