nanomq: OOB Read / Crash (DoS) via Malformed MQTT Remaining Length over WebSocket_CVE-2026-25627

{
    "lastseen": "",
    "description": "NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. Prior to version 0.24.8, NanoMQ\u2019s MQTT-over-WebSocket transport can be crashed by sending an MQTT packet with a deliberately large Remaining Length in the fixed header while providing a much shorter actual payload. The code path copies Remaining Length bytes without verifying that the current receive buffer contains that many bytes, resulting in an out-of-bounds read (ASAN reports OOB / crash). This is remotely triggerable over the WebSocket listener. This issue has been patched in version 0.24.8.",
    "published": "2026-03-30T20:11:08.586Z",
    "modified": "2026-03-31T19:09:34.784Z",
    "type": "cve",
    "title": "nanomq: OOB Read / Crash (DoS) via Malformed MQTT Remaining Length over WebSocket",
    "source": "GitHub_M",
    "references": "https://github.com/nanomq/nanomq/security/advisories/GHSA-w4rh-v3h2-j29x\nhttps://github.com/nanomq/NanoNNG/pull/1405\nhttps://github.com/nanomq/NanoNNG/commit/e80b30bad6d855593a68d18f2785bfaca6faf09e\nhttps://github.com/nanomq/nanomq/releases/tag/0.24.8",
    "id": "CVE-2026-25627",
    "bulletinFamily": "",
    "cwe": [
        "CWE-125"
    ],
    "cvelist": null,
    "sourceData": "nanomq nanomq < 0.24.8",
    "sourceHref": "",
    "cvss": {
        "score": 6.5,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "nanomq",
    "version": "< 0.24.8",
    "vendor": "nanomq",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}