{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-81529",
        "assignerOrgId": "a39b4221-9bd0-4244-95fc-f3e2e07f1deb",
        "state": "PUBLISHED",
        "assignerShortName": "mongodb",
        "dateReserved": "2026-08-26T22:14:30.340Z",
        "datePublished": "2026-08-27T18:32:31.650Z",
        "dateUpdated": "2026-08-27T18:37:56.222Z"
    },
    "containers": {
        "cna": {
            "title": "Connection-option injection via unescaped settings in the canonical MongoDB URL builder",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-88",
                            "description": "CWE-88: Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "MongoDB",
                    "product": "C# Driver",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "3.5.0",
                            "lessThan": "3.11.1",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Improper neutralization of delimiters in connection-URL construction allows connection-option injection in the MongoDB C# Driver. When an application passes untrusted text into the driver's connection-URL builder and round-trips the builder back into a client configuration, the untrusted text is serialized without neutralizing the URL/option delimiters and is then re-parsed as authoritative connection options. A low-privileged user of such an application can thereby introduce or suppress security-relevant connection settings.",
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                            "base64": false,
                            "value": "Improper neutralization of delimiters in connection-URL construction allows connection-option injection in the MongoDB C# Driver. When an application passes untrusted text into the driver's connection-URL builder and round-trips the builder back into a client configuration, the untrusted text is serialized without neutralizing the URL/option delimiters and is then re-parsed as authoritative connection options. A low-privileged user of such an application can thereby introduce or suppress security-relevant connection settings."
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://www.nuget.org/packages/MongoDB.Driver/3.11.1"
                }
            ],
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                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "HIGH",
                        "vulnIntegrityImpact": "LOW",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "HIGH",
                        "subIntegrityImpact": "LOW",
                        "subAvailabilityImpact": "NONE",
                        "exploitMaturity": "NOT_DEFINED",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
                        "version": "4.0",
                        "baseSeverity": "HIGH",
                        "baseScore": 7.1,
                        "vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N"
                    }
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                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "scope": "CHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "LOW",
                        "availabilityImpact": "NONE",
                        "baseSeverity": "HIGH",
                        "baseScore": 7.1,
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N"
                    }
                }
            ],
            "source": {
                "discovery": "INTERNAL"
            },
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            "providerMetadata": {
                "orgId": "a39b4221-9bd0-4244-95fc-f3e2e07f1deb",
                "shortName": "mongodb",
                "dateUpdated": "2026-08-27T18:37:56.222Z"
            }
        }
    }
}