CVE-2025-66400 | THREATINT

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.

PUBLISHED Reserved 2025-11-28 | Published 2025-12-01 | Updated 2025-12-02 | Assigner GitHub_M

MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-20: Improper Input Validation

CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes

Product status

>= 13.0.0, < 13.2.1

affected

References

github.com/...o-hast/security/advisories/GHSA-4fh9-h7wg-q85m

github.com/...ommit/6fc783ae6abdeb798fd5a68e7f3f21411dde7403

github.com/...ommit/ab3a79570a1afbfa7efef5d4a0cd9b5caafbc5d7

cve.org (CVE-2025-66400)

nvd.nist.gov (CVE-2025-66400)

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