UBUNTU-CVE-2021-20270

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    UBUNTU-CVE-2021-20270

    Published: 9 Mar 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2021-20270

    Summary:

    Details: An infinite loop in SMLLexer in Pygments versions 1.5 to 2.7.3 may lead to denial of service when performing syntax highlighting of a Standard ML (SML) source file, as demonstrated by input that only contains the "exception" keyword.

    References: https://ubuntu.com/security/CVE-2021-20270, https://ubuntu.com/security/notices/USN-4885-1, https://ubuntu.com/security/notices/USN-4897-2, https://www.cve.org/CVERecord?id=CVE-2021-20270

    Affected packages

    Package

    Name: pygments

    Purl: pkg:deb/ubuntu/[email protected]+dfsg-1ubuntu1.1+esm1?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.6+dfsg-1ubuntu1.1+esm1

    Affected versions

    1.6+dfsg-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-2021-20270 | CVE-DB