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    CVE-2025-66622

    matrix-sdk-base is the base component to build a Matrix client library. Versions 0.14.1 and prior are unable to handle responses that include custom m.room.join_rules values due to a serialization bug. This can be exploited to cause a denial-of-service condition, if a user is invited to a room with non-standard join rules, the crate's sync process will stall, preventing further processing for all rooms. This is fixed in version 0.16.0.

    Published:Dec 9, 2025
    Last Modified:Mar 17, 2026
    EPS:Dec 9, 2025
    EPSS Score:0.00063
    CVSS Score:7.5

    Affected Products

    Vendor
    Matrix
    Product
    Matrix-rust-sdk
    Vendor
    Matrix-org
    Product
    Matrix-rust-sdk

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    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