CVE-2026-111758
Description
markdown-it is a Markdown parser. From versions 14.1.0 to before 14.3.3, and 15.0.0 to before 15.0.3, a link reference definition whose label or title is never closed is O(n²) with default options. Continuation lines are pulled lazily with str += lineContent in src/rules_block/reference.ts, and the subsequent charCodeAt and slice calls flatten the V8 cons-string, copying everything collected so far; this runs before the rule decides the definition is invalid. No options are required to trigger it. This issue has been patched in versions 14.3.3 and 15.0.3.
How to fix
- markdown-it14.3.3, 15.0.3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| markdown-itnpm | 14.1.0 ≤ v < 14.3.3, 15.0.0 ≤ v < 15.0.3 | 14.3.3, 15.0.3 |
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Attack Surface Management
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