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    2 vulnerabilities found for CocoaMQTT by emqx

    CVE-2026-30867 (GCVE-0-2026-30867)

    Vulnerability from nvd – Published: 2026-04-02 13:57 – Updated: 2026-04-02 16:23
    VLAI
    Title
    CocoaMQTT: Denial of Service via Reachable Assertion in `PUBLISH` Packet Parsing
    Summary
    CocoaMQTT is a MQTT 5.0 client library for iOS and macOS written in Swift. Prior to version 2.2.2, a vulnerability exists in the packet parsing logic of CocoaMQTT that allows an attacker (or a compromised/malicious MQTT broker) to remotely crash the host iOS/macOS/tvOS application. If an attacker publishes the 4-byte malformed payload to a shared topic with the RETAIN flag set to true, the MQTT broker will persist the payload. Any time a vulnerable client connects and subscribes to that topic, the broker will automatically push the malformed packet. The app will instantly crash in the background before the user can even interact with it. This effectively "bricks" the mobile application (a persistent DoS) until the retained message is manually wiped from the broker database. This issue has been patched in version 2.2.2.
    Severity
    5.7 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    emqx CocoaMQTT Affected: < 2.2.2
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-30867 (GCVE-0-2026-30867)

    Vulnerability from cvelistv5 – Published: 2026-04-02 13:57 – Updated: 2026-04-02 16:23
    VLAI
    Title
    CocoaMQTT: Denial of Service via Reachable Assertion in `PUBLISH` Packet Parsing
    Summary
    CocoaMQTT is a MQTT 5.0 client library for iOS and macOS written in Swift. Prior to version 2.2.2, a vulnerability exists in the packet parsing logic of CocoaMQTT that allows an attacker (or a compromised/malicious MQTT broker) to remotely crash the host iOS/macOS/tvOS application. If an attacker publishes the 4-byte malformed payload to a shared topic with the RETAIN flag set to true, the MQTT broker will persist the payload. Any time a vulnerable client connects and subscribes to that topic, the broker will automatically push the malformed packet. The app will instantly crash in the background before the user can even interact with it. This effectively "bricks" the mobile application (a persistent DoS) until the retained message is manually wiped from the broker database. This issue has been patched in version 2.2.2.
    Severity
    5.7 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    Assigner
    References
    Impacted products
    Vendor Product Version
    emqx CocoaMQTT Affected: < 2.2.2
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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