PYSEC-2016-4

    Dashboard / Vulnerabilities / PYSEC-2016-4

    PYSEC-2016-4

    Published: 1 Sept 2016Last Modified: 10 Jun 2026

    Summary:

    Details: The _Rsa15 class in the RSA 1.5 algorithm implementation in jwa.py in jwcrypto before 0.3.2 lacks the Random Filling protection mechanism, which makes it easier for remote attackers to obtain cleartext data via a Million Message Attack (MMA).

    References: https://github.com/latchset/jwcrypto/commit/eb5be5bd94c8cae1d7f3ba9801377084d8e5a7ba, https://github.com/latchset/jwcrypto/issues/65, https://github.com/latchset/jwcrypto/pull/66, https://github.com/latchset/jwcrypto/releases/tag/v0.3.2, http://www.securityfocus.com/bid/92729, https://github.com/advisories/GHSA-wg33-x934-3ghh

    Affected packages

    Package

    Name: jwcrypto

    Purl: pkg:pypi/jwcrypto

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -eb5be5bd94c8cae1d7f3ba9801377084d8e5a7ba

    Affected versions

    0.2.0
    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