{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-55859",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-06-17T16:44:40.995Z",
        "datePublished": "2026-08-28T22:48:41.592Z",
        "dateUpdated": "2026-08-28T22:48:41.592Z"
    },
    "containers": {
        "cna": {
            "title": "MariaDB Connector/R2DBC: Inappropriate Encoding for Output Context and Improper Encoding or Escaping of Output in org.mariadb:r2dbc-mariadb",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-116",
                            "lang": "en",
                            "description": "CWE-116: Improper Encoding or Escaping of Output",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-838",
                            "lang": "en",
                            "description": "CWE-838: Inappropriate Encoding for Output Context",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "HIGH",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "NONE",
                        "baseScore": 5.9,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-5rqc-86vf-g8r2",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-5rqc-86vf-g8r2"
                },
                {
                    "name": "https://github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/38bad9afebc6c581a853656a42f9ebf403b1b1b7",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/38bad9afebc6c581a853656a42f9ebf403b1b1b7"
                },
                {
                    "name": "https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1"
                },
                {
                    "name": "https://jira.mariadb.org/browse/R2DBC-124",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://jira.mariadb.org/browse/R2DBC-124"
                }
            ],
            "affected": [
                {
                    "vendor": "mariadb-corporation",
                    "product": "mariadb-connector-r2dbc",
                    "versions": [
                        {
                            "version": "< 1.4.1",
                            "status": "affected"
                        }
                    ]
                },
                {
                    "vendor": "org.mariadb",
                    "product": "r2dbc-mariadb",
                    "versions": [
                        {
                            "version": "< 1.4.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-08-28T22:48:41.592Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "MariaDB Connector/R2DBC is a non-blocking MariaDB and MySQL client implemented in Java. Prior to 1.4.1, org.mariadb:r2dbc-mariadb encodes and decodes all character data under the assumption that the connection character set is UTF-8. A server can announce a mid-session change to character_set_client through the OK-packet session-state-tracking mechanism, including through SET NAMES executed by a stored routine or trigger, server configuration, or a hostile or man-in-the-middle server. If the new character set is not UTF-8, the driver continues to exchange UTF-8 while the server interprets the same bytes under a different encoding, causing silent data corruption and a client/server charset-confusion mismatch that can defeat byte-wise quoting or escaping. The fix accepts only utf8, utf8mb3, or utf8mb4 after initialization; any other value raises R2dbcNonTransientResourceException with SQLState 08000 and closes the connection. This issue is fixed in version 1.4.1."
                }
            ],
            "source": {
                "advisory": "GHSA-5rqc-86vf-g8r2",
                "discovery": "UNKNOWN"
            }
        }
    }
}