{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-66067",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-07-23T23:25:28.897Z",
        "datePublished": "2026-09-23T20:12:00.076Z",
        "dateUpdated": "2026-09-24T14:11:44.566Z"
    },
    "containers": {
        "cna": {
            "title": "RabbitMQ: Stream protocol skips per vhost per user connection limits",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-770",
                            "lang": "en",
                            "description": "CWE-770: Allocation of Resources Without Limits or Throttling",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 6,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-hwqx-2gfg-89qf",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/rabbitmq/rabbitmq-server/security/advisories/GHSA-hwqx-2gfg-89qf"
                },
                {
                    "name": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.2.7"
                },
                {
                    "name": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.3.1"
                }
            ],
            "affected": [
                {
                    "vendor": "rabbitmq",
                    "product": "rabbitmq-server",
                    "versions": [
                        {
                            "version": ">= 4.2.0, < 4.2.7",
                            "status": "affected"
                        },
                        {
                            "version": ">= 4.3.0, < 4.3.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-09-23T20:12:00.076Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "RabbitMQ is a messaging and streaming broker. Prior to versions 4.2.7 and 4.3.1, The stream open handler calls only check_vhost_access; it omits the node/vhost/user connection-limit checks that rabbit_reader performs for AMQP. A developer %% FIXME comment at the cited line explicitly acknowledges the gap. No compensating enforcement exists in connection tracking or elsewhere in rabbitmq_stream. An authenticated tenant can fully bypass operator-configured per-user and per-vhost connection caps by connecting via port 5552 instead of 5672. Preconditions include rabbitmq_stream plugin enabled Authenticated stream-protocol credentials Operator relies on per-user/per-vhost connection limits for tenant isolation. This issue is fixed in versions 4.2.7 and 4.3.1."
                }
            ],
            "source": {
                "advisory": "GHSA-hwqx-2gfg-89qf",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-09-24T14:11:25.836720Z",
                                "id": "CVE-2026-66067",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "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": "2026-09-24T14:11:44.566Z"
                }
            }
        ]
    }
}