Description

mdast-util-to-hast is an mdast utility to transform to hast. From 13.0.0 to before 13.2.1, multiple (unprefixed) classnames could be added in markdown source by using character references. This could make rendered user supplied markdown code elements appear like the rest of the page. This vulnerability is fixed in 13.2.1.

INFO

Published Date :

2025-12-01T22:17:42.705Z

Last Modified :

2025-12-02T15:34:24.293Z

Source :

GitHub_M
AFFECTED PRODUCTS

The following products are affected by CVE-2025-66400 vulnerability.

Vendors Products
Syntax-tree
  • Mdast-util-to-hast
Unifiedjs
  • Mdast-util-to-hast
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-66400.

URL Resource
https://github.com/syntax-tree/mdast-util-to-hast/commit/6fc783ae6abdeb798fd5a68e7f3f21411dde7403 cve-icon cve-icon cve-icon
https://github.com/syntax-tree/mdast-util-to-hast/commit/ab3a79570a1afbfa7efef5d4a0cd9b5caafbc5d7 cve-icon cve-icon cve-icon
https://github.com/syntax-tree/mdast-util-to-hast/security/advisories/GHSA-4fh9-h7wg-q85m cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2025-66400 cve-icon
https://www.cve.org/CVERecord?id=CVE-2025-66400 cve-icon
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CVSS Vulnerability Scoring System

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Detailed values of each vector for above chart.
Attack Vector
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Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact