USN-3138-1

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    USN-3138-1

    Published: 28 Nov 2016Last Modified: 10 Feb 2026

    Summary: python-cryptography vulnerability

    Details: Markus Döring discovered that python-cryptography incorrectly handled certain HKDF lengths. This could result in python-cryptography returning an empty string instead of the expected derived key.

    References: https://ubuntu.com/security/notices/USN-3138-1, https://ubuntu.com/security/CVE-2016-9243

    Affected packages

    Package

    Name: python-cryptography

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.2.3-1ubuntu0.1

    Affected versions

    1.0.1-1ubuntu1
    1.0.2-1

    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
    USN-3138-1 | CVE-DB