Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow_CVE-2026-9740

{
    "lastseen": "",
    "description": "A vulnerability in MongoDB Server's BSON validation logic allows an unauthenticated user to crash the mongod process by sending a specially crafted message. The BSON validator's handling of certain nested binary data structures permits uncontrolled mutual recursion between validation functions, where each re-entry resets internal depth tracking.",
    "published": "2026-06-09T22:43:44.291Z",
    "modified": "2026-06-09T22:43:44.291Z",
    "type": "cve",
    "title": "Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow",
    "source": "mongodb",
    "references": "https://jira.mongodb.org/browse/SERVER-125063",
    "id": "CVE-2026-9740",
    "bulletinFamily": "",
    "cwe": [
        "CWE-674"
    ],
    "cvelist": null,
    "sourceData": "MongoDB MongoDB Server 8.3.0\nMongoDB MongoDB Server 8.2.0\nMongoDB MongoDB Server 8.0.0\nMongoDB MongoDB Server 7.0.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "MongoDB Server",
    "version": "8.3.0, 8.2.0, 8.0.0, 7.0.0",
    "vendor": "MongoDB",
    "ai_description": "Unauthenticated stack overflow in MongoDB Server's BSON validation logic due to uncontrolled mutual recursion",
    "ai_severity": "High",
    "ai_vendor": "MongoDB",
    "ai_product": "MongoDB Server",
    "ai_version": "8.3.0, 8.2.0, 8.0.0, 7.0.0",
    "ai_score": 8.7
}