Description
markdown-it is a Markdown parser. Prior to 14.3.2 and 15.0.2, smartquotes is affected: many opening quotes of one type followed by unmatched closing quotes of the other type cause the smartquotes rule to repeatedly scan the entire opener stack, resulting in quadratic processing time. The root cause is each mismatched quote closer repeatedly scans the opener stack for a compatible quote type. The attack mechanism is quadratic rescanning of the quote opener stack. The affected identifiers are smartquotes and typographer. The trigger conditions are attacker-controlled Markdown with many openers of one quote type and unmatched closers of the other type and typographer mode is enabled. The impact is denial of service through excessive parsing time. The vulnerable path requires typographer mode; disabling typographer or the smartquotes rule prevents the affected processing. This issue is fixed in versions 14.3.2 and 15.0.2.
Published: 2026-10-19
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Mon, 19 Oct 2026 17:45:00 +0000

Type Values Removed Values Added
Description markdown-it is a Markdown parser. Prior to 14.3.2 and 15.0.2, smartquotes is affected: many opening quotes of one type followed by unmatched closing quotes of the other type cause the smartquotes rule to repeatedly scan the entire opener stack, resulting in quadratic processing time. The root cause is each mismatched quote closer repeatedly scans the opener stack for a compatible quote type. The attack mechanism is quadratic rescanning of the quote opener stack. The affected identifiers are smartquotes and typographer. The trigger conditions are attacker-controlled Markdown with many openers of one quote type and unmatched closers of the other type and typographer mode is enabled. The impact is denial of service through excessive parsing time. The vulnerable path requires typographer mode; disabling typographer or the smartquotes rule prevents the affected processing. This issue is fixed in versions 14.3.2 and 15.0.2.
Title markdown-it: Quadratic complexity in smartquotes with unmatched closing quotes
Weaknesses CWE-400
CWE-407
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-19T17:46:20.544Z

Reserved: 2026-10-16T17:52:09.081Z

Link: CVE-2026-111759

cve-icon Vulnrichment

No data.

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-400

    Uncontrolled Resource Consumption

  • CWE-407

    Inefficient Algorithmic Complexity