What’s Vulnerable › Vulnerabilities

CVE-2026-107819: MariaDB Connector/C: libmariadb allowed cleartext password leakage on TLS hostname verification failure

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-09 · updated 2026-10-13
• Weakness: CWE-297

Description

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.

Affected products

• MariaDB server: from 3.4.1, < 3.4.10

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

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