GHSA-9q5w-79cv-947m

    Dashboard / Vulnerabilities / GHSA-9q5w-79cv-947m

    GHSA-9q5w-79cv-947m

    Published: 7 Sept 2021Last Modified: 8 Jul 2026

    Summary: Unsafe defaults in `remark-html`

    Details: ### Impact The documentation of `remark-html` has mentioned that it was safe by default. In practise the default was never safe and had to be opted into. This means arbitrary HTML can be passed through leading to potential XSS attacks. ### Patches The problem has been patched in 13.0.2 and 14.0.1: `remark-html` is now safe by default, and the implementation matches the documentation. ### Workarounds On older affected versions, pass `sanitize: true`, like so: ```diff - .use(remarkHtml) + .use(remarkHtml, {sanitize: true}) ``` ### References n/a ### For more information If you have any questions or comments about this advisory: * Open an issue in [`remark-html`](https://github.com/remarkjs/remark-html) * Email us at [[email protected]](mailto:[email protected])

    References: https://github.com/remarkjs/remark-html/security/advisories/GHSA-9q5w-79cv-947m, https://nvd.nist.gov/vuln/detail/CVE-2021-39199, https://github.com/remarkjs/remark-html/commit/b75c9dde582ad87ba498e369c033dc8a350478c1, https://github.com/remarkjs/remark-html, https://github.com/remarkjs/remark-html/releases/tag/14.0.1, https://www.npmjs.com/package/remark-html

    Affected packages

    Package

    Name: remark-html

    Purl: pkg:npm/remark-html

    Affected ranges

    Type: SEMVER

    Events:

    Introduced- 0
    Fixed -13.0.2

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    GHSA-9q5w-79cv-947m | CVE-DB