npm package report

Is mdast-util-to-hast safe?

1 known vulnerability, worst severity MODERATE.

// reach

0 direct dependencies

none carry a known advisory

    15 packages depend on it

    an advisory here reaches each of them

    Create a free accountfor every dependency path, dependent and what to upgrade
    // ai model usage

    Tracked for PyPI packages. HuggingFace models declare Python dependencies, so npm packages are not covered.

    cvss
    5.3
    medium

    CVSS v3.1 base score out of 10

    epss
    0.33%
    low

    chance of exploitation in 30 days, 26th percentile of all CVEs

    xyz score
    not scored

    CyberXYZ composite out of 10

    fig. 01 — GHSA-4fh9-h7wg-q85m, the advisory selected below

    // 1 advisories

    GHSA-4fh9-h7wg-q85m

    MODERATEGitHub ratingCVE-2025-66400
    // impact

    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. The following markdown:

    Would create <pre><code class="language-js xss"></code></pre> If your page then applied .xss classes (or listeners in JS), those apply to this element. For more info see <https://github.com/ChALkeR/notes/blob/master/Improper-markup-sanitization.md#unsanitized-class-attribute>

    // patches

    The bug was patched. When using regular semver, run npm install. For exact ranges, make sure to use 13.2.1.

    // workarounds

    Update.

    // references
    // cvss v3.1 vector

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

    Attack vector
    Network
    Attack complexity
    Low
    Privileges required
    None
    User interaction
    None
    Scope
    Unchanged
    Confidentiality
    None
    Integrity
    Low
    Availability
    None

    Checked 2026-11-07 at 18:04 UTC. The most recent advisory here was published 2025-12-02. Updated continuously from NVD, GHSA, OSV and CNA feeds.

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