Vulnerability · Published Aug 28, 2026 · Assigned by GitHub_M
CVE-2026-55857MariaDB Connector/J: Cleartext Transmission of Sensitive Information and Insufficiently Protected Credentials
Medium 5.9
In plain English
A medium-severity security flaw in mariadb-connector-j from mariadb-corporation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 33% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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, PAM dialog authentication can be coerced into transmitting the account password over an insecure connection. The mysql_clear_password plugin is gated behind a secure transport, but the sibling PAM handler SendPamAuthPacketFactory, named dialog by the server, does not declare that requirement and inherits the default secure-required value false; older branches implement the same affected behavior in SendPamAuthPacket. A hostile or man-in-the-middle server can send an Authentication Switch Request for dialog over plain TCP, causing the driver to return the user's password in cleartext when sslMode=DISABLE and restrictedAuth=null, which is the default configuration. Properly verified TLS and local Unix sockets are not exposed to this transport vector. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | org.mariadb.jdbc:mariadb-java-client | 2.7.14 | GHSA-qxvw-fvwx-5cp7 |
| Maven | org.mariadb.jdbc:mariadb-java-client | 3.3.5 | GHSA-qxvw-fvwx-5cp7 |
| Maven | org.mariadb.jdbc:mariadb-java-client | 3.4.3 | GHSA-qxvw-fvwx-5cp7 |
| Maven | org.mariadb.jdbc:mariadb-java-client | 3.5.9 | GHSA-qxvw-fvwx-5cp7 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| mariadb-corporation | mariadb-connector-j | < 2.7.14>= 3.0.0, < 3.3.5>= 3.4.0, < 3.4.3>= 3.5.0, < 3.5.9 |
Weakness: CWE-319, CWE-522 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
References
- https://github.com/mariadb-corporation/mariadb-connector-j/security/advisories/GHSA-qxvw-fvwx-5cp7 x_refsource_CONFIRM
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/a8599ab1cbe4b8818ea945bf56a4e012c302b388 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/commit/f4a727c764d1cf48fd0c3d5e301dfa92503e0a58 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.4.3 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-j/releases/tag/3.5.9 x_refsource_MISC
- https://jira.mariadb.org/browse/CONJ-1320 x_refsource_MISC