{"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","CWE-295"],"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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55856.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-55856"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2525813"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-55856"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55856"}],"tags":["nvd","ghsa","maven","csaf","vex","red-hat"],"epss":0.00443,"epssPercentile":0.38306,"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\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: OpenShift Pipelines, Red Hat build of Debezium 3, Red Hat Build of Keycloak, Red Hat build of Quarkus, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, … · no fix planned: Red Hat Fuse 7, Red Hat Single Sign-On 7, Red Hat Hardened Images, Red Hat OpenShift GitOps, … · updated 2026-10-05 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-55856.json)","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}