Inefficient Algorithmic Complexity Affecting markdown-it package, versions <14.2.0
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-MARKDOWNIT-17353909
- published17 Jun 2026
- disclosed15 Jun 2026
- creditByunSuyoung
Introduced: 15 Jun 2026
NewCVE-2026-48988 (opens in a new tab)How to fix?
Upgrade markdown-it to version 14.2.0 or higher.
Overview
markdown-it is a modern pluggable markdown parser.
Affected versions of this package are vulnerable to Inefficient Algorithmic Complexity through the replaceAt() function in the smartquotes rule when processing markdown input with a large number of consecutive quotation marks and the typographer option enabled. An attacker can cause excessive CPU consumption and disrupt service availability by submitting specially crafted markdown content containing many quote characters.