CVE-2026-48988

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.

• CWE-400

• https://github.com/markdown-it/markdown-it/commit/9ce2087562c45d1e5ddd9f76b990f4b3fbe040e5Patch
• https://github.com/markdown-it/markdown-it/security/advisories/GHSA-6v5v-wf23-fmfqExploit, Mitigation, Vendor Advisory
• https://github.com/markdown-it/markdown-it/security/advisories/GHSA-6v5v-wf23-fmfqExploit, Mitigation, Vendor Advisory

Published

Jun 17, 2026

Last Modified

Jun 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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