{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-16266",
        "assignerOrgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730",
        "state": "PUBLISHED",
        "assignerShortName": "snyk",
        "dateReserved": "2026-07-20T08:55:21.686Z",
        "datePublished": "2026-07-21T05:00:00.647Z",
        "dateUpdated": "2026-07-21T14:52:06.858Z"
    },
    "containers": {
        "cna": {
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "exploitCodeMaturity": "NOT_DEFINED",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "CHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "LOW",
                        "availabilityImpact": "NONE",
                        "baseScore": 4,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N"
                    },
                    "cvssV4_0": {
                        "version": "4.0",
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "exploitMaturity": "NOT_DEFINED",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "LOW",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 6.3,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N"
                    }
                }
            ],
            "credits": [
                {
                    "value": "Dezhen Kong",
                    "lang": "en"
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-1321",
                            "description": "Prototype Pollution",
                            "lang": "en"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "bae035ff-b466-4ff4-94d0-fc9efd9e1730",
                "shortName": "snyk",
                "dateUpdated": "2026-07-21T05:00:00.647Z"
            },
            "descriptions": [
                {
                    "value": "Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in util.js. An attacker can modify the JavaScript prototype chain by supplying a crafted property path containing special keys such as __proto__.",
                    "lang": "en"
                }
            ],
            "references": [
                {
                    "url": "https://security.snyk.io/vuln/SNYK-JS-MONGOOBJECT-13816714"
                },
                {
                    "url": "https://github.com/longshotlabs/mongo-object/issues/27"
                },
                {
                    "url": "https://github.com/longshotlabs/mongo-object/blob/4f7a570f2a2fcfa9417b7870d5f859e9574ec73c/src/util.ts%23L251"
                },
                {
                    "url": "https://github.com/longshotlabs/mongo-object/commit/638314107d8b397e5453c28e41729522b3e8d67c"
                }
            ],
            "affected": [
                {
                    "product": "mongo-object",
                    "versions": [
                        {
                            "version": "0",
                            "lessThan": "3.0.3",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ],
                    "vendor": "n/a"
                }
            ]
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/longshotlabs/mongo-object/issues/27",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-07-21T14:41:50.967466Z",
                                "id": "CVE-2026-16266",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-07-21T14:52:06.858Z"
                }
            }
        ]
    }
}