{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55856","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-17T16:44:40.995Z","datePublished":"2026-08-28T22:41:14.376Z","dateUpdated":"2026-08-28T22:41:14.376Z"},"containers":{"cna":{"title":"MariaDB Connector/J: Cleartext password disclosure to a MITM on the initial-handshake","problemTypes":[{"descriptions":[{"cweId":"CWE-522","lang":"en","description":"CWE-522: Insufficiently Protected Credentials","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38","tags":["x_refsource_CONFIRM"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056"},{"name":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a","tags":["x_refsource_MISC"],"url":"https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a"},{"name":"https://hackerone.com/reports/3777370","tags":["x_refsource_MISC"],"url":"https://hackerone.com/reports/3777370"},{"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-1325","tags":["x_refsource_MISC"],"url":"https://jira.mariadb.org/browse/CONJ-1325"}],"affected":[{"vendor":"mariadb-corporation","product":"mariadb-connector-j","versions":[{"version":"< 2.7.14","status":"affected"},{"version":">= 3.0.0, < 3.3.5","status":"affected"},{"version":">= 3.4.0, < 3.4.3","status":"affected"},{"version":">= 3.5.0, < 3.5.9","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-28T22:41:14.376Z"},"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, 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."}],"source":{"advisory":"GHSA-g9jj-cgmh-9f38","discovery":"UNKNOWN"}}}}