CVE-2021-39199

    Dashboard / Vulnerabilities / CVE-2021-39199

    CVE-2021-39199

    Published: 7 Sept 2021Last Modified: 9 Jul 2026

    Summary:

    Details: remark-html is an open source nodejs library which compiles Markdown to HTML. In affected versions the documentation of remark-html has mentioned that it was safe by default. In practice the default was never safe and had to be opted into. That is, user input was not sanitized. This means arbitrary HTML can be passed through leading to potential XSS attacks. 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. On older affected versions, pass `sanitize: true` if you cannot update.

    References: https://www.npmjs.com/package/remark-html, https://github.com/remarkjs/remark-html/commit/b75c9dde582ad87ba498e369c033dc8a350478c1, https://github.com/remarkjs/remark-html/releases/tag/14.0.1, https://github.com/remarkjs/remark-html/security/advisories/GHSA-9q5w-79cv-947m

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -2133d209ab423ead9c6360ab93850f03a1101d8a

    Affected versions

    13.0.1
    13.0.0

    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
    CVE-2021-39199 | CVE-DB