CVE-2016-9243

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    CVE-2016-9243

    Published: 27 Mar 2017Last Modified: 8 Jul 2026

    Summary:

    Details: HKDF in cryptography before 1.5.2 returns an empty byte-string if used with a length less than algorithm.digest_size.

    References: http://www.securityfocus.com/bid/94216, http://www.ubuntu.com/usn/USN-3138-1, https://cryptography.io/en/latest/changelog, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5R2ZOBMPWDFFHUZ6QOZZY36A6H5CGJXL/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/U23KDR2M2N7W2ZSREG63BVW7D4VC6CIZ/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQ5G7KHKZC4SI23JE7277KZXM57GEQKT/, https://github.com/pyca/cryptography/issues/3211, http://www.openwall.com/lists/oss-security/2016/11/09/2, https://github.com/pyca/cryptography/commit/b924696b2e8731f39696584d12cceeb3aeb2d874

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.5.2
    1.5.1
    1.5

    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