{"id":"CVE-2026-55856","title":"MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases","summary":"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 pa…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-522"],"vendor":"mariadb","product":"org.mariadb.jdbc:mariadb-java-client","affected":["org.mariadb.jdbc:mariadb-java-client < 2.7.14","org.mariadb.jdbc:mariadb-java-client >= 3.0.0, < 3.3.5","org.mariadb.jdbc:mariadb-java-client >= 3.4.0, < 3.4.3","org.mariadb.jdbc:mariadb-java-client >= 3.5.0, < 3.5.9"],"patched":["org.mariadb.jdbc:mariadb-java-client 2.7.14","org.mariadb.jdbc:mariadb-java-client 3.3.5","org.mariadb.jdbc:mariadb-java-client 3.4.3","org.mariadb.jdbc:mariadb-java-client 3.5.9"],"published":"2026-08-28","updated":"2026-09-08","sourceUpdated":"2026-09-08T21:08:37.320","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55856","references":[{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056","label":"security-advisories@github.com"},{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a","label":"security-advisories@github.com"},{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3","label":"security-advisories@github.com"},{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9","label":"security-advisories@github.com"},{"url":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38","label":"security-advisories@github.com"},{"url":"https://hackerone.com/reports/3777370","label":"security-advisories@github.com"},{"url":"https://jira.mariadb.org/browse/CONJ-1325","label":"security-advisories@github.com"},{"url":"https://github.com/advisories/GHSA-g9jj-cgmh-9f38"}],"tags":["nvd","ghsa","maven"],"epss":0.00222,"epssPercentile":0.13002,"aliases":["GHSA-g9jj-cgmh-9f38"],"ecosystem":"maven","ingestedAt":"2026-08-28T23:26:57.433Z","slug":"CVE-2026-55856","body":"## Overview\n\nMariaDB 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-55856)\n\nAffected packages:\n\n- `org.mariadb.jdbc:mariadb-java-client < 2.7.14`\n- `org.mariadb.jdbc:mariadb-java-client >= 3.0.0, < 3.3.5`\n- `org.mariadb.jdbc:mariadb-java-client >= 3.4.0, < 3.4.3`\n- `org.mariadb.jdbc:mariadb-java-client >= 3.5.0, < 3.5.9`\n\nPatched in:\n\n- `org.mariadb.jdbc:mariadb-java-client 2.7.14`\n- `org.mariadb.jdbc:mariadb-java-client 3.3.5`\n- `org.mariadb.jdbc:mariadb-java-client 3.4.3`\n- `org.mariadb.jdbc:mariadb-java-client 3.5.9`\n\nSource: https://github.com/advisories/GHSA-g9jj-cgmh-9f38","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}