{"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"}}}}

{}

{"affected": [{"affectedData": [{"product": "mariadb-connector-r2dbc", "vendor": "mariadb-corporation", "versions": [{"status": "affected", "version": "< 1.4.1"}]}, {"product": "r2dbc-mariadb", "vendor": "org.mariadb", "versions": [{"status": "affected", "version": "< 1.4.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-55859", "lastModified": "2026-08-28T23:17:09.007", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-08-28T23:17:09.007", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/38bad9afebc6c581a853656a42f9ebf403b1b1b7"}, {"source": "security-advisories@github.com", "url": "https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-5rqc-86vf-g8r2"}, {"source": "security-advisories@github.com", "url": "https://jira.mariadb.org/browse/R2DBC-124"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-116"}, {"lang": "en", "value": "CWE-838"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"created": "2026-08-29T00:45:04.367950+00:00", "updated": "2026-08-29T00:45:04.367964+00:00", "vendors": []}