TDengine has an integer underflow in uvConnMayGetUserInfo() allows unauthenticated remote crash (DoS)_CVE-2026-42542

{
    "lastseen": "",
    "description": "TDengine is an open source, time-series database optimized for Internet of Things devices. In versions 3.4.0.0 through 3.4.1.5, an unauthenticated remote attacker can crash the taosd server process by sending a single crafted RPC packet. No credentials or prior session state are required. Version 3.4.1.6 fixes the issue.",
    "published": "2026-06-10T20:32:38.985Z",
    "modified": "2026-06-10T20:32:38.985Z",
    "type": "cve",
    "title": "TDengine has an integer underflow in uvConnMayGetUserInfo() allows unauthenticated remote crash (DoS)",
    "source": "GitHub_M",
    "references": "https://github.com/taosdata/TDengine/security/advisories/GHSA-vg95-j2hf-hvjx\nhttps://github.com/taosdata/TDengine/releases/tag/ver-3.4.1.6",
    "id": "CVE-2026-42542",
    "bulletinFamily": "",
    "cwe": [
        "CWE-191"
    ],
    "cvelist": null,
    "sourceData": "taosdata TDengine >= 3.4.0.0, < 3.4.1.6",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/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": "TDengine",
    "version": ">= 3.4.0.0, < 3.4.1.6",
    "vendor": "taosdata",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}