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    CVE-2026-45078

    Synapse is an open source Matrix homeserver implementation. Prior to 1.152.1, local authenticated users can cause Synapse to starve other requests of CPU and lead to other requests failing, causing other users to be denied service. This vulnerability is fixed in 1.152.1.

    Published:May 28, 2026
    Last Modified:Jun 3, 2026
    EPS:May 28, 2026
    EPSS Score:0.00014
    CVSS Score:5.5

    Affected Products

    Vendor
    Element
    Product
    Synapse
    Vendor
    Element-hq
    Product
    Synapse

    Exploits

    No exploit reference

    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