CVE-2018-6829

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    CVE-2018-6829

    Published: 7 Feb 2018Last Modified: 8 Jul 2026

    Summary:

    Details: cipher/elgamal.c in Libgcrypt through 1.8.2, when used to encrypt messages directly, improperly encodes plaintexts, which allows attackers to obtain sensitive information by reading ciphertext data (i.e., it does not have semantic security in face of a ciphertext-only attack). The Decisional Diffie-Hellman (DDH) assumption does not hold for Libgcrypt's ElGamal implementation.

    References: https://www.oracle.com/security-alerts/cpujan2020.html, https://github.com/weikengchen/attack-on-libgcrypt-elgamal, https://lists.gnupg.org/pipermail/gcrypt-devel/2018-February/004394.html, https://github.com/weikengchen/attack-on-libgcrypt-elgamal/wiki

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    libgcrypt-1.8.2
    libgcrypt-1.8.1
    libgcrypt-1.8.0

    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
    CVE-2018-6829 | CVE-DB