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mdast-util-to-hast

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.

CVE-2025-66400 affects the mdast-util-to-hast utility, a component of the syntax-tree project that transforms markdown abstract syntax trees (mdast) into hypertext abstract syntax trees (hast). Between versions 13.0.0 and before 13.2.1, the utility improperly validates input by allowing multiple unprefixed classnames to be injected into markdown source through the use of character references. This flaw arises from inadequate sanitization and normalization of class attribute inputs, enabling an attacker to craft markdown content that, when rendered, applies arbitrary CSS classes to code elements. Consequently, user-supplied markdown code blocks can be visually disguised to appear consistent with other page elements, potentially facilitating UI spoofing or misleading users about the origin or nature of displayed content. The vulnerability is classified under CWE-20 (Improper Input Validation) and CWE-915 (Improperly Controlled Modification of Object Prototype Attributes), highlighting the root cause as insufficient input checks. Exploitation requires no privileges or user interaction and can be performed remotely by submitting malicious markdown content. The vulnerability was publicly disclosed on December 1, 2025, with a CVSS 4.0 base score of 6.9 (medium severity). The issue is resolved in mdast-util-to-hast version 13.2.1, which properly sanitizes classnames and prevents injection via character references. No known active exploits have been reported to date.

Detailed information about CVE-2025-66400: CWE-20: Improper Input Validation in syntax-tree mdast-util-to-hast affecting syntax-tree mdast-util-to-hast. Get rea

CVE-2025-66400: CWE-20: Improper Input Validation in syntax-tree mdast-util-to-hast - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-66400: CWE-20: Improper Input Validation in syntax-tree mdast-util-to-hast

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