UBUNTU-CVE-2021-3426

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    UBUNTU-CVE-2021-3426

    Published: 20 May 2021Last Modified: 22 Apr 2026
    Upstream:
    CVE-2021-3426

    Summary:

    Details: There's a flaw in Python 3's pydoc. A local or adjacent attacker who discovers or is able to convince another local or adjacent user to start a pydoc server could access the server and use it to disclose sensitive information belonging to the other user that they would not normally be able to access. The highest risk of this flaw is to data confidentiality. This flaw affects Python versions before 3.8.9, Python versions before 3.9.3 and Python versions before 3.10.0a7.

    References: https://ubuntu.com/security/CVE-2021-3426, https://python-security.readthedocs.io/vuln/pydoc-getfile.html, https://github.com/python/cpython/pull/24337, https://github.com/python/cpython/pull/24285, https://ubuntu.com/security/notices/USN-5342-1, https://ubuntu.com/security/notices/USN-5342-3, https://www.cve.org/CVERecord?id=CVE-2021-3426, https://ubuntu.com/security/notices/USN-6891-1

    Affected packages

    Package

    Name: python3.4

    Purl: pkg:deb/ubuntu/[email protected]~14.04.7+esm12?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.4.3-1ubuntu1~14.04.7+esm12

    Affected versions

    3.4~b1-0ubuntu3

    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-2021-3426 | CVE-DB