CVE-2026-107819

MariaDB Connector/C is a C and C++ client library for connecting applications to MariaDB and MySQL databases. From 3.4.1 until 3.4.10, the MariaDB Connector/C libmariadb Zero-Configuration SSL authentication-switch logic checked certificate trust failure but did not reject a TLS hostname verification mismatch before selecting a non-hashing authentication plugin. An active man-in-the-middle attacker with a valid certificate for another hostname could request mysql_clear_password and obtain the database password inside the attacker-controlled TLS connection. Other MariaDB connectors are not affected. This issue is fixed in version 3.4.10.

Score

CVSS 3.1 5.9 Medium

Status

Awaiting Analysis - security-advisories@github.com

Published

2026-10-09

Last modified

2026-10-13

Weaknesses

CWE-297

Affected products

• Server (Mariadb)

References

• https://github.com/MariaDB/server/security/advisories/GHSA-fmq9-qjxj-qpf7
• https://github.com/mariadb-corporation/mariadb-connector-c/commit/e8c0a16d94ddf844668d684a7d42b37ac8e0fc02
• https://github.com/mariadb-corporation/mariadb-connector-c/releases/tag/v3.4.10
• https://jira.mariadb.org/browse/CONC-846