{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55856",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-17T16:44:40.995Z",
        "datePublished": "2026-08-28T22:41:14.376Z",
        "dateUpdated": "2026-08-28T22:41:14.376Z"
    },
    "containers": {
        "cna": {
            "title": "MariaDB Connector/J: Cleartext password disclosure to a MITM on the initial-handshake",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-522",
                            "lang": "en",
                            "description": "CWE-522: Insufficiently Protected Credentials",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.9,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38"
                },
                {
                    "name": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056"
                },
                {
                    "name": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a"
                },
                {
                    "name": "https://hackerone.com/reports/3777370",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://hackerone.com/reports/3777370"
                },
                {
                    "name": "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3"
                },
                {
                    "name": "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9"
                },
                {
                    "name": "https://jira.mariadb.org/browse/CONJ-1325",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://jira.mariadb.org/browse/CONJ-1325"
                }
            ],
            "affected": [
                {
                    "vendor": "mariadb-corporation",
                    "product": "mariadb-connector-j",
                    "versions": [
                        {
                            "version": "< 2.7.14",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.0.0, < 3.3.5",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.4.0, < 3.4.3",
                            "status": "affected"
                        },
                        {
                            "version": ">= 3.5.0, < 3.5.9",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-28T22:41:14.376Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. Prior to 2.7.14, 3.3.5, 3.4.3, and 3.5.9, when a Java application connects with sslMode=verify-full or sslMode=verify-ca, supplies a password, and does not configure serverSslCert or trustStore, Connector/J can accept an untrusted self-signed certificate through the fallbackToSystemTrustStore=true ephemeral trust manager and record its certFingerprint for later identity binding. The OK-packet and authentication-switch paths enforce the certificate fingerprint, but the initial-handshake path does not. HandshakeResponse.encode() can therefore build and send a mysql_clear_password response before checking certFingerprint != null && !isMitMProof(), sslMode, or whether the authentication plugin is resistant to a man-in-the-middle, and the initial path also bypasses restrictedAuth. An active man-in-the-middle or hostile server can present a self-signed certificate, claim to be MariaDB, select mysql_clear_password as the initial authentication plugin, and receive the full database password before the connection is rejected. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9."
                }
            ],
            "source": {
                "advisory": "GHSA-g9jj-cgmh-9f38",
                "discovery": "UNKNOWN"
            }
        }
    }
}