{"cve":"CVE-2026-55856","nvd":{"published":"2026-08-28T23:17:08.513","modified":"2026-09-08T21:08:37.320","status":"Awaiting Analysis","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, 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-522"],"references":["https://github.com/mariadb-corporation/mariadb-connector-j/commit/149ec6a626376214966c01f42d48be1b80d06056","https://github.com/mariadb-corporation/mariadb-connector-j/commit/d90b9872322c76b05a48219be66bff1d33102f8a","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://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-g9jj-cgmh-9f38"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:50.842544443+00:00"},"epss":{"cve":"CVE-2026-55856","score":0.00443,"percentile":0.38504,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-g9jj-cgmh-9f38","url":"https://osv.dev/vulnerability/GHSA-g9jj-cgmh-9f38","summary":"MariaDB has cleartext password disclosure to a MITM on the initial-handshake","modified":"2026-09-10T03:50:53.696281286Z","packages":[{"ecosystem":"Maven","name":"org.mariadb.jdbc:mariadb-java-client","purl":"pkg:maven/org.mariadb.jdbc/mariadb-java-client","ranges":["<2.7.14"],"fixed":["2.7.14"]},{"ecosystem":"Maven","name":"org.mariadb.jdbc:mariadb-java-client","purl":"pkg:maven/org.mariadb.jdbc/mariadb-java-client","ranges":[">=3.0.0 <3.3.5"],"fixed":["3.3.5"]},{"ecosystem":"Maven","name":"org.mariadb.jdbc:mariadb-java-client","purl":"pkg:maven/org.mariadb.jdbc/mariadb-java-client","ranges":[">=3.4.0 <3.4.3"],"fixed":["3.4.3"]},{"ecosystem":"Maven","name":"org.mariadb.jdbc:mariadb-java-client","purl":"pkg:maven/org.mariadb.jdbc/mariadb-java-client","ranges":[">=3.5.0 <3.5.9"],"fixed":["3.5.9"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}