CVE-2026-33218

{
    "cve": {
        "id": "CVE-2026-33218",
        "cveTags": [],
        "metrics": {
            "cvssMetricV31": [
                {
                    "type": "Secondary",
                    "source": "security-advisories@github.com",
                    "cvssData": {
                        "scope": "UNCHANGED",
                        "version": "3.1",
                        "baseScore": 7.5,
                        "attackVector": "NETWORK",
                        "baseSeverity": "HIGH",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "integrityImpact": "NONE",
                        "userInteraction": "NONE",
                        "attackComplexity": "LOW",
                        "availabilityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "confidentialityImpact": "NONE"
                    },
                    "impactScore": 3.6,
                    "exploitabilityScore": 3.9
                }
            ]
        },
        "published": "2026-03-25T20:16:32.623",
        "references": [
            {
                "url": "https://advisories.nats.io/CVE/secnote-2026-10.txt",
                "tags": [
                    "Mitigation",
                    "Vendor Advisory"
                ],
                "source": "security-advisories@github.com"
            },
            {
                "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-vprv-35vv-q339",
                "tags": [
                    "Mitigation",
                    "Vendor Advisory"
                ],
                "source": "security-advisories@github.com"
            }
        ],
        "vulnStatus": "Analyzed",
        "weaknesses": [
            {
                "type": "Primary",
                "source": "security-advisories@github.com",
                "description": [
                    {
                        "lang": "en",
                        "value": "CWE-20"
                    }
                ]
            }
        ],
        "descriptions": [
            {
                "lang": "en",
                "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.15 and 2.12.6, a client which can connect to the leafnode port can crash the nats-server with a certain malformed message pre-authentication. Versions 2.11.15 and 2.12.6 contain a fix. As a workaround, disable leafnode support if not needed or restrict network connections to the leafnode port, if plausible without compromising the service offered."
            },
            {
                "lang": "es",
                "value": "NATS-Server es un servidor de alto rendimiento para NATS.io, un sistema de mensajer\u00eda nativo de la nube y del borde. Antes de las versiones 2.11.15 y 2.12.6, un cliente que puede conectarse al puerto leafnode puede bloquear el nats-server con un mensaje malformado espec\u00edfico pre-autenticaci\u00f3n. Las versiones 2.11.15 y 2.12.6 contienen una correcci\u00f3n. Como soluci\u00f3n alternativa, deshabilite el soporte de leafnode si no es necesario o restrinja las conexiones de red al puerto leafnode, si es factible sin comprometer el servicio ofrecido."
            }
        ],
        "lastModified": "2026-03-26T17:15:02.390",
        "configurations": [
            {
                "nodes": [
                    {
                        "negate": false,
                        "cpeMatch": [
                            {
                                "criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
                                "vulnerable": true,
                                "matchCriteriaId": "13EA156E-2759-4586-A22E-CDEAAD4D610C",
                                "versionEndExcluding": "2.11.15"
                            },
                            {
                                "criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*",
                                "vulnerable": true,
                                "matchCriteriaId": "4E347CFB-C56D-4FD8-8DD8-3D34C08D7154",
                                "versionEndExcluding": "2.12.6",
                                "versionStartIncluding": "2.12.0"
                            }
                        ],
                        "operator": "OR"
                    }
                ]
            }
        ],
        "sourceIdentifier": "security-advisories@github.com"
    }
}