CVE-2026-55857: Mariadb java client Mariadb-java-client Has Cleartext Transmission Of Vulnerability

{
  "schema_version" : "1.4.0",
  "id" : "GHSA-qxvw-fvwx-5cp7",
  "modified" : "2026-08-28T22:45:01Z",
  "published" : "2026-08-28T22:45:01Z",
  "aliases" : [ "CVE-2026-55857" ],
  "summary" : "org.mariadb.jdbc:mariadb-java-client has Cleartext Transmission of Sensitive Information and Insufficiently Protected Credentials",
  "details" : "### Summary\n\nWhen PAM (dialog) authentication is used, the connector can be coerced into sending the account password in cleartext over an insecure connection. A hostile or man-in-the-middle server can trigger this with the default configuration, disclosing the user's password.\n\n### Details\n\nThe mysql_clear_password plugin is gated behind a secure connection: the driver refuses to transmit the password in cleartext over plain TCP. The sibling PAM plugin handler (SendPamAuthPacketFactory, server-side plugin name dialog) did not override that gate and inherited the default value false, so it was not subject to the same secure-transport requirement.\n\nAs a result, a hostile or man-in-the-middle server can issue an Authentication Switch Request for the dialog plugin over plain TCP, and the driver responds with the user's password in cleartext. With the default configuration (sslMode=DISABLE, restrictedAuth=null) this is reachable with no non-default options.\n\n### Am I affected?\n\nYou are affected if all of the following hold:\n\n\n* You use mariadb Connector/J at a version below the patched release(s).\n* Connections can occur over an insecure transport — i.e. plain TCP (sslMode=DISABLE), or a TLS mode that establishes server identity only via self-signed-certificate fingerprint validation.\n* An attacker can occupy an on-path (MITM) position, or otherwise cause the client to connect to a server they control, and present an Authentication Switch Request for the dialog plugin.\n\nConnections over properly verified TLS or a local Unix socket are not exposed to this vector.\n\n### Impact\n\nDisclosure of the authenticating account's password in cleartext to an on-path or hostile server. The captured credentials can then be reused to authenticate to the database.\n\n### Patches\n\nFixed in 2.7.14, 3.3.5, 3.4.3, and 3.5.9. Upgrade to the patched release on your branch (3.5.x → 3.5.9, 3.4.x → 3.4.3, 3.0/3.1/3.2/3.3.x → 3.3.5, 2.x → 2.7.14). PAM (dialog) is now treated exactly like mysql_clear_password: it may only run over a secure transport. SendPamAuthPacketFactory overrides the secure-required flag to true, and the authentication dispatcher permits a secure-required plugin only when the connection is TLS or a local Unix socket. The pre-existing check that blocks non-MITM-proof plugins when server identity relies solely on self-signed-certificate fingerprint validation continues to apply. Net effect: PAM is allowed over TLS or a Unix socket, and rejected over plain TCP or fingerprint-only connections.\n\n### Workarounds\n\nIf you cannot upgrade immediately:\n\n* Connect over verified TLS (set sslMode=verify-full) so a man-in-the-middle cannot impersonate the server, or use a local Unix socket.\n* Restrict the permitted authentication plugins via restrictedAuth so dialog cannot be negotiated over an insecure transport.\n\n\n### Credit\n\nReported by Yalguun Tumenkhuu ([@fg0x0](https://github.com/fg0x0/)).",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.mariadb.jdbc:mariadb-java-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.7.14"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.mariadb.jdbc:mariadb-java-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.0"
      }, {
        "fixed" : "3.3.5"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.mariadb.jdbc:mariadb-java-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.4.0"
      }, {
        "fixed" : "3.4.3"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.mariadb.jdbc:mariadb-java-client"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.5.0"
      }, {
        "fixed" : "3.5.9"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-qxvw-fvwx-5cp7"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mariadb-corporation/mariadb-connector-j/commit/a8599ab1cbe4b8818ea945bf56a4e012c302b388"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mariadb-corporation/mariadb-connector-j/commit/f4a727c764d1cf48fd0c3d5e301dfa92503e0a58"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/mariadb-corporation/mariadb-connector-j"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9"
  }, {
    "type" : "WEB",
    "url" : "https://jira.mariadb.org/browse/CONJ-1320"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-319", "CWE-522" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-08-28T22:45:01Z",
    "nvd_published_at" : null
  }
}