CVE-2026-111758— markdown-it: Quadratic-time rendering of a single multi-line link reference definition with default options (regression since 14.0)
Quick assessment
Affected
markdown-it markdown-it
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
markdown-it 是一个 Markdown 解析器。在 14.1.0 至 14.3.3（不含）以及 15.0.0 至 15.0.3（不含）的版本中，若链接引用定义的标签（label）或标题（title）未正确闭合，在默认配置下会导致 O(n²) 的时间复杂度。在 文件中，续行内容通过 的方式惰性拉取；随后调用的 和 操作会强制将 V8 的 cons-string 扁平化，从而复制截至目前收集的所有内容；而这一操作发生在解析器判定该定义无效之前。触发此问题无需任何特殊配置选项。该漏洞已在 14.3.3 和 15
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I. Basic Information for CVE-2026-111758
Vulnerability Information
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Vulnerability Title
markdown-it: Quadratic-time rendering of a single multi-line link reference definition with default options (regression since 14.0)
Source: CVE Program / CVE List V5
Vulnerability Description
markdown-it is a Markdown parser. From versions 14.1.0 to before 14.3.3, and 15.0.0 to before 15.0.3, a link reference definition whose label or title is never closed is O(n²) with default options. Continuation lines are pulled lazily with str += lineContent in src/rules_block/reference.ts, and the subsequent charCodeAt and slice calls flatten the V8 cons-string, copying everything collected so far; this runs before the rule decides the definition is invalid. No options are required to trigger it. This issue has been patched in versions 14.3.3 and 15.0.3.
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
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| markdown-it | markdown-it | >= 14.1.0, < 14.3.3 | - |
|
II. Public POCs for CVE-2026-111758
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-111758 (1)
-
🔗 Release 15.0.3 · markdown-it/markdown-it · GitHub x_refsource_MISC
Vendor Pages for CVE-2026-111758 (1)
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🔗 Release 14.3.3 · markdown-it/markdown-it · GitHub x_refsource_MISC
Other References for CVE-2026-111758 (2)
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