{"id":"CVE-2026-55858","state":"PUBLISHED","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.","publishedAt":"2026-08-28T22:46:40.114Z","updatedAt":"2026-09-01T02:06:07.389Z","severity":{"score":5.9,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["mariadb-corporation mariadb-connector-j"],"affected":[{"vendor":"mariadb-corporation","product":"mariadb-connector-j","versions":[{"version":"< 2.7.14","status":"affected"},{"version":">= 3.0.0-alpha, < 3.3.5","status":"affected"},{"version":">= 3.4.0, < 3.4.3","status":"affected"},{"version":">= 3.5.0, < 3.5.9","status":"affected"}]}],"references":["https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-xvr9-35cr-46v9","https://github.com/mariadb-corporation/mariadb-connector-j/commit/300716bef1e1d0370a41be7863b88aa2d55fbb69","https://github.com/mariadb-corporation/mariadb-connector-j/commit/7b3c69221b5463ee03472654040b3f6b9e5329c7","https://github.com/mariadb-corporation/mariadb-connector-j/commit/8cfd9df697372ad4ed09fe87a34b34babb6d43d6","https://github.com/mariadb-corporation/mariadb-connector-j/commit/c555c9b477521be0c35c3a5461f9f46681553607","https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/2.7.14","https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.3.5","https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3","https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9","https://jira.mariadb.org/browse/CONJ-1317"],"weaknesses":["CWE-838"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55858.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55858","state":"PUBLISHED","datePublished":"2026-08-28T22:46:40.114Z","dateUpdated":"2026-09-01T02:06:07.389Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-17T16:44:40.995Z"},"containers":{"cna":{"title":"MariaDB Connector/J: Inappropriate Encoding for Output Context in org.mariadb.jdbc:mariadb-java-client","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, 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."}],"affected":[{"vendor":"mariadb-corporation","product":"mariadb-connector-j","versions":[{"version":"< 2.7.14","status":"affected"},{"version":">= 3.0.0-alpha, < 3.3.5","status":"affected"},{"version":">= 3.4.0, < 3.4.3","status":"affected"},{"version":">= 3.5.0, < 3.5.9","status":"affected"}]}],"references":[{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-xvr9-35cr-46v9","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/commit/300716bef1e1d0370a41be7863b88aa2d55fbb69","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/7b3c69221b5463ee03472654040b3f6b9e5329c7","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/8cfd9df697372ad4ed09fe87a34b34babb6d43d6","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/c555c9b477521be0c35c3a5461f9f46681553607","name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/c555c9b477521be0c35c3a5461f9f46681553607","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/2.7.14","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/3.3.5","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/3.4.3","tags":["x_refsource_MISC"]},{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9","name":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9","tags":["x_refsource_MISC"]},{"url":"https://jira.mariadb.org/browse/CONJ-1317","name":"https://jira.mariadb.org/browse/CONJ-1317","tags":["x_refsource_MISC"]}],"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","lang":"en","description":"CWE-838: Inappropriate Encoding for Output Context","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-28T22:46:40.114Z"},"source":{"advisory":"GHSA-xvr9-35cr-46v9","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-01T02:05:48.275903Z","id":"CVE-2026-55858","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-01T02:06:07.389Z"}}]}}}