Vulnerability record · CVE-2021-21306 · published 8 February 2021

CVE-2021-21306: Marked project marked uncontrolled resource consumption vulnerability

MMarked Project · Marked

Marked is an open-source markdown parser and compiler (npm package "marked"). In marked from version 1.1.1 and before version 2.0.0, there is a Regular expression Denial of Service vulnerability. This vulnerability can affect anyone who runs user generated code through marked. This vulnerability is fixed in version 2.0.0.

7.5 CVSS 3.1 High EPSS 2.5% · top 16.2% CWE-400 · Uncontrolled resource consumption

7.5CVSS 3.1 base score, v2 5.0

2.5%EPSS exploitation probability, 30 days

NoNot in CISA KEV

1Affected product versions listed by NVD

10References

17 Jun 2026Last modified by NVD

Description

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

MMarked Marked Project

References

Link	Tags
https://github.com/markedjs/marked/commit/7293251c438e3ee968970f7609f1a27f9007bccd	PatchThird Party Advisory
https://github.com/markedjs/marked/issues/1927	Third Party Advisory
https://github.com/markedjs/marked/pull/1864	PatchThird Party Advisory
https://github.com/markedjs/marked/security/advisories/GHSA-4r62-v4vq-hr96	Third Party Advisory
https://www.npmjs.com/package/marked	ProductThird Party Advisory
https://github.com/markedjs/marked/commit/7293251c438e3ee968970f7609f1a27f9007bccd	PatchThird Party Advisory
https://github.com/markedjs/marked/issues/1927	Third Party Advisory
https://github.com/markedjs/marked/pull/1864	PatchThird Party Advisory
https://github.com/markedjs/marked/security/advisories/GHSA-4r62-v4vq-hr96	Third Party Advisory
https://www.npmjs.com/package/marked	ProductThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-21306), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.