{"api_version":"1","generated_at":"2026-08-29T03:55:33+00:00","cve":"CVE-2026-55858","urls":{"html":"https://cve.report/CVE-2026-55858","api":"https://cve.report/api/cve/CVE-2026-55858.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-55858","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55858"},"summary":{"title":"MariaDB Connector/J: Inappropriate Encoding for Output Context in org.mariadb.jdbc:mariadb-java-client","description":"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, the connector encodes and decodes protocol text and performs client-side escaping under the assumption that the connection character set is UTF-8. The server can report a mid-session change to character_set_client through OK-packet session-state tracking, including a change caused by SET NAMES, a stored routine or trigger, server configuration, or a hostile server. If character_set_client changes to a non-UTF-8 value, the driver continues to read and write UTF-8 while the server interprets the same bytes under another 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 causes SQLException with SQLState 08000 and closes the connection. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9.","state":"PUBLISHED","assigner":"GitHub_M","published_at":"2026-08-28 23:17:08","updated_at":"2026-08-28 23:17:08"},"problem_types":["CWE-838","CWE-838 CWE-838: Inappropriate Encoding for Output 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This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9."}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-838","description":"CWE-838: Inappropriate Encoding for Output Context","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-08-28T22:46:40.114Z","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M"},"references":[{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-xvr9-35cr-46v9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-xvr9-35cr-46v9"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/300716bef1e1d0370a41be7863b88aa2d55fbb69","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/300716bef1e1d0370a41be7863b88aa2d55fbb69"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/7b3c69221b5463ee03472654040b3f6b9e5329c7","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/7b3c69221b5463ee03472654040b3f6b9e5329c7"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/8cfd9df697372ad4ed09fe87a34b34babb6d43d6","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/8cfd9df697372ad4ed09fe87a34b34babb6d43d6"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/c555c9b477521be0c35c3a5461f9f46681553607","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/c555c9b477521be0c35c3a5461f9f46681553607"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/2.7.14","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/2.7.14"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.5","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.5"},{"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-1317","tags":["x_refsource_MISC"],"url":"https://jira.mariadb.org/browse/CONJ-1317"}],"source":{"advisory":"GHSA-xvr9-35cr-46v9","discovery":"UNKNOWN"},"title":"MariaDB Connector/J: Inappropriate Encoding for Output Context in org.mariadb.jdbc:mariadb-java-client"}},"cveMetadata":{"assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","assignerShortName":"GitHub_M","cveId":"CVE-2026-55858","datePublished":"2026-08-28T22:46:40.114Z","dateReserved":"2026-06-17T16:44:40.995Z","dateUpdated":"2026-08-28T22:46:40.114Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-28 23:17:08","lastModifiedDate":"2026-08-28 23:17:08","problem_types":["CWE-838","CWE-838 CWE-838: Inappropriate Encoding for Output Context"],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"HIGH","availabilityImpact":"NONE"},"exploitabilityScore":2.2,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"55858","Ordinal":"1","Title":"MariaDB Connector/J: Inappropriate Encoding for Output Context i","CVE":"CVE-2026-55858","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"55858","Ordinal":"1","NoteData":"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, the connector encodes and decodes protocol text and performs client-side escaping under the assumption that the connection character set is UTF-8. The server can report a mid-session change to character_set_client through OK-packet session-state tracking, including a change caused by SET NAMES, a stored routine or trigger, server configuration, or a hostile server. If character_set_client changes to a non-UTF-8 value, the driver continues to read and write UTF-8 while the server interprets the same bytes under another 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 causes SQLException with SQLState 08000 and closes the connection. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9.","Type":"Description","Title":"MariaDB Connector/J: Inappropriate Encoding for Output Context i"}]}}}