markdown-it: Quadratic complexity in smartquotes with unmatched closing quotes

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-111759
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-19 18:17:00 UTC
Updated2026-10-19 19:17:23 UTC
Descriptionmarkdown-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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-400 | CWE-407 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-407 CWE-407: Inefficient Algorithmic Complexity

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Markdown-it Markdown-it affected >= 15.0.0, < 15.0.2 Not specified
CNA Markdown-it Markdown-it affected < 14.3.2 Not specified

References

ReferenceSourceLinkTags
github.com/markdown-it/markdown-it/security/advisories/GHSA-r7fv-28h4-cvq7 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/markdown-it/markdown-it/releases/tag/15.0.2 [email protected] github.com
github.com/markdown-it/markdown-it/releases/tag/14.3.2 [email protected] github.com
github.com/markdown-it/markdown-it/commit/daf5a3c32303e5d9de01b12eeb725f... [email protected] github.com
github.com/markdown-it/markdown-it/commit/1b379c1b6d0522421bd1a51b77337c... [email protected] github.com
github.com/markdown-it/markdown-it/commit/cf27366035edf9196667110c47d9d6... [email protected] github.com
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