PYSEC-2026-2620

    Dashboard / Vulnerabilities / PYSEC-2026-2620

    PYSEC-2026-2620

    Published: 9 Jul 2026Last Modified: 13 Jul 2026

    Summary: matrix-sydent and matrix-synapse Use Cryptographically Weak PRNG

    Details: An issue was discovered in Matrix Sydent before 1.0.3 and Synapse before 0.99.3.1. Random number generation is mishandled, which makes it easier for attackers to predict a Sydent authentication token or a Synapse random ID.

    References: https://nvd.nist.gov/vuln/detail/CVE-2019-11842, https://github.com/advisories/GHSA-gwf7-vfjf-wf6x, https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2019-185.yaml, https://matrix.org/blog/2019/05/03/security-updates-sydent-1-0-3-synapse-0-99-3-1-and-riot-android-0-9-0-0-8-99-0-8-28-a, https://pypi.org/project/matrix-sydent

    Affected packages

    Package

    Name: matrix-sydent

    Purl: pkg:pypi/matrix-sydent

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1.0.3

    Affected versions

    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
    PYSEC-2026-2620 | CVE-DB