Bug 2548735 (CVE-2026-107819)

Summary:	CVE-2026-107819 mariadb-connector-c: mariadb-connector-c: Information disclosure via improper TLS hostname verification
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	rhel-process-autobot, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in MariaDB Connector/C. During automatic Transport Layer Security (TLS) connection setup, the library verifies certificate trust but fails to confirm that the server hostname matches the certificate before switching authentication methods. An active man-in-the-middle (MitM) attacker with a valid certificate for a different domain can exploit this vulnerability to intercept the encrypted connection, request plaintext authentication, and capture database passwords.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-10-09 17:31:48 UTC

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.