UBUNTU-CVE-2021-28834

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    UBUNTU-CVE-2021-28834

    Published: 19 Mar 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-28834
    Aliases:
    USN-6424-1

    Summary:

    Details: Kramdown before 2.3.1 does not restrict Rouge formatters to the Rouge::Formatters namespace, and thus arbitrary classes can be instantiated.

    References: https://ubuntu.com/security/CVE-2021-28834, https://github.com/gettalong/kramdown/compare/REL_2_3_0...REL_2_3_1, https://github.com/gettalong/kramdown/pull/708, https://gitlab.com/gitlab-org/gitlab/-/commit/179329b5c3c118924fb242dc449d06b4ed6ccb66, https://ubuntu.com/security/notices/USN-6424-1, https://www.cve.org/CVERecord?id=CVE-2021-28834

    Affected packages

    Package

    Name: ruby-kramdown

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.17.0-4ubuntu0.2

    Affected versions

    1.17.0-1
    1.17.0-2
    1.17.0-4
    1.17.0-4ubuntu0.1

    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
    UBUNTU-CVE-2021-28834 | CVE-DB