CVE-2026-48988

Description

markdown-it is a Markdown parser. Versions 14.1.1 and below contain a denial-of-service vulnerability when typographer: true is enabled, due to quadratic (O(n^2)) processing in the smartquotes rule. The issue stems from repeatedly modifying strings with replaceAt(), which performs O(n) slicing and concatenation per quote character. This can cause excessive CPU consumption when parsing quote-heavy, user-supplied markdown and may let attackers degrade or disrupt service availability. Although typographer is disabled by default, many production apps enable it for smart typography, making the issue relevant. This issue has been fixed in version 14.2.0.

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Produits concernés

• markdown-it
• Markdown-it project markdown-it

Scores CVSS

Faiblesses (CWE)

• CWE-400

Références

• https://github.com/markdown-it/markdown-it/commit/9ce2087562c45d1e5ddd9f76b990f4b3fbe040e5 Patch
• https://github.com/markdown-it/markdown-it/security/advisories/GHSA-6v5v-wf23-fmfq ExploitMitigationVendor Advisory
• https://github.com/markdown-it/markdown-it/security/advisories/GHSA-6v5v-wf23-fmfq ExploitMitigationVendor Advisory

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories