MariaDB Connector/C: libmariadb allowed cleartext password leakage on TLS hostname verification failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107819
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-09 18:17:03 UTC
Updated2026-10-09 18:17:03 UTC
DescriptionMariaDB 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-297 | CWE-297 CWE-297: Improper Validation of Certificate with Host Mismatch

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA MariaDB Server affected >= 3.4.1, < 3.4.10 Not specified

References

ReferenceSourceLinkTags
github.com/MariaDB/server/security/advisories/GHSA-fmq9-qjxj-qpf7 [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-c/commit/e8c0a16d94ddf8... [email protected] github.com
jira.mariadb.org/browse/CONC-846 [email protected] jira.mariadb.org
github.com/mariadb-corporation/mariadb-connector-c/releases/tag/v3.4.10 [email protected] github.com
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