CVE-2021-26813

    Dashboard / Vulnerabilities / CVE-2021-26813

    CVE-2021-26813

    Published: 3 Mar 2021Last Modified: 8 Jul 2026

    Summary:

    Details: markdown2 >=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY/, https://github.com/trentm/python-markdown2/pull/387

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 6d11f0f1ef9e112faeaf8028f631d2f825f991a6
    Fixed -31491857f247f553c4006b7ef55823deefb9e8e9

    Affected versions

    2.3.10
    2.3.9
    2.3.8
    2.3.7
    2.3.6
    2.3.5
    2.3.4
    2.3.3
    2.3.2
    2.3.1
    2.3.0

    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-2021-26813 | CVE-DB