UBUNTU-CVE-2020-14343

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    UBUNTU-CVE-2020-14343

    Published: 9 Feb 2021Last Modified: 4 Feb 2026
    Upstream:
    CVE-2020-14343
    Aliases:
    USN-4940-1

    Summary:

    Details: A vulnerability was discovered in the PyYAML library in versions before 5.4, where it is susceptible to arbitrary code execution when it processes untrusted YAML files through the full_load method or with the FullLoader loader. Applications that use the library to process untrusted input may be vulnerable to this flaw. This flaw allows an attacker to execute arbitrary code on the system by abusing the python/object/new constructor. This flaw is due to an incomplete fix for CVE-2020-1747.

    References: https://ubuntu.com/security/CVE-2020-14343, https://github.com/yaml/pyyaml/wiki/PyYAML-yaml.load(input)-Deprecation, https://ubuntu.com/security/notices/USN-4940-1, https://www.cve.org/CVERecord?id=CVE-2020-14343

    Affected packages

    Package

    Name: pyyaml

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -5.3.1-1ubuntu0.1

    Affected versions

    5.1.2-1
    5.1.2-1build1

    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-2020-14343 | CVE-DB