Coturn: Misaligned Memory Access in coturn STUN Attribute Parser (Remote DoS on ARM64)_CVE-2026-40613

{
    "lastseen": "",
    "description": "Coturn is a free open source implementation of TURN and STUN Server. Prior to 4.10.0, the STUN/TURN attribute parsing functions in coturn perform unsafe pointer casts from uint8_t * to uint16_t * without alignment checks. When processing a crafted STUN message with odd-aligned attribute boundaries, this results in misaligned memory reads at ns_turn_msg.c. On ARM64 architectures (AArch64) with strict alignment enforcement, this causes a SIGBUS signal that immediately kills the turnserver process. An unauthenticated remote attacker can crash any ARM64 coturn deployment by sending a single crafted UDP packet. This vulnerability is fixed in 4.10.0.",
    "published": "2026-04-21T18:00:53.342Z",
    "modified": "2026-04-21T18:00:53.342Z",
    "type": "cve",
    "title": "Coturn: Misaligned Memory Access in coturn STUN Attribute Parser (Remote DoS on ARM64)",
    "source": "GitHub_M",
    "references": "https://github.com/coturn/coturn/security/advisories/GHSA-j662-9wcj-mf36",
    "id": "CVE-2026-40613",
    "bulletinFamily": "",
    "cwe": [
        "CWE-704"
    ],
    "cvelist": null,
    "sourceData": "coturn coturn < 4.10.0",
    "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": [],
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        "baseScore": 0,
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        "privilegesRequired": "",
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        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "coturn",
    "version": "< 4.10.0",
    "vendor": "coturn",
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    "ai_score": 0
}