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    CVE-2026-21888

    NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.

    Published:Mar 11, 2026
    Last Modified:Mar 23, 2026
    EPS:Mar 11, 2026
    EPSS Score:0.00063
    CVSS Score:7.5

    Affected Products

    Vendor
    Emqx
    Product
    Nanomq
    Vendor
    Nanomq
    Product
    Nanomq

    Exploits

    https://github.com/nanomq/nanomq/security/advisories/GHSA-cggc-6m7w-j7x5

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

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    CVE-2026-34608 (CVSS 4.9) — NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.10, in NanoMQ's we…
    CVE-2026-32696 (CVSS 3.1) — NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In NanoMQ version 0.24.6, after enabling…
    CVE-2026-25627 (CVSS 6.5) — NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.8, NanoMQ’s MQTT-o…
    CVE-2026-22040 (CVSS 5.3) — NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, by generating a combi…
    CVE-2025-68699 (CVSS 6.5) — NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. In version 0.24.6, NanoMQ has a protocol…
    CVE-2024-48077 (CVSS 7.5) — NanoMQ v0.22.7 is vulnerable to Denial of Service (DoS) due to improper resource throttling. A crafted sequenc…
    CVE-2025-66023 (CVSS 6.9) — NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Versions prior to 0.24.5 have a Heap-Use…
    CVE-2025-59946 (CVSS 7.5) — NanoMQ MQTT Broker (NanoMQ) is an Edge Messaging Platform. Prior to version 0.24.2, there is a classical data …

    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