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CVE-2026-111759— markdown-it: Quadratic complexity in smartquotes with unmatched closing quotes

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 14.3.2 和 15.0.2 版本之前，当启用 选项时，精心构造的 Markdown 内容会导致 smartquotes 规则出现二次方（O(n²)）的处理时间，从而可能在处理不可信输入的应用中引发拒绝服务（DoS）攻击。具体表现为：大量未匹配的左双引号后紧跟右单引号，会触发对整个“开启引号栈”的重复扫描；若引号类型互换（即大量左单引号后接未匹配的右双引号），也会出现相同问题。默认配置（ ）不受此漏洞影响，但该选项在实际使用中被启用的概率很高。该问题已

CVSS 7.5 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
markdown-it markdown-it >= 15.0.0, < 15.0.2 affected
< 14.3.2 affected
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I. Basic Information for CVE-2026-111759

Vulnerability Information
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Vulnerability Title
markdown-it: Quadratic complexity in smartquotes with unmatched closing quotes
Source: CVE Program / CVE List V5
Vulnerability Description
markdown-it is a Markdown parser. Prior to 14.3.2 and 15.0.2, when typographer: true is enabled, specially crafted Markdown can cause quadratic processing time in the smartquotes rule, potentially leading to denial of service in applications processing untrusted input. Many opening double quotes followed by unmatched closing single quotes cause repeated scans of the entire opener stack. The same issue occurs with the quote types reversed. The default configuration (typographer: false) is not affected, but this option is enabled with high probability. This issue is fixed in versions 14.3.2 and 15.0.2.
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 >= 15.0.0, < 15.0.2 -

II. Public POCs for CVE-2026-111759

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III. Intelligence Information for CVE-2026-111759

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Other References for CVE-2026-111759 (6)

IV. Related Vulnerabilities

Same product: markdown-it
Same vendor: markdown-it
Same weakness: CWE-400

V. Comments for CVE-2026-111759

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