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Vulnerability record · CVE-2026-55215 · published 28 August 2026

CVE-2026-55215: Improper certificate validation vulnerability

MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to versions 3.3.3, 3.4.6, and 3.5.3, when ssl is enabled without a pinned CA or server certificate, MariaDB Connector/Node.js sends credentials before completing certificate fingerprint validation. In lib/cmd/handshake/auth/handshake.js, a server that selects mysql_clear_password as the initial authentication plugin can receive the password before the post-TLS identity check. In lib/cmd/handshake/authentication.js, an authentication switch can evaluate the previous plugin instead of the requested target plugin, allowing mysql_clear_password to send the credential first. An active man-in-the-middle can present a self-signed certificate, capture the database password, and use it to authenticate directly even though the connector later rejects the server and closes the connection. This issue is fixed in versions 3.3.3, 3.4.6, and 3.5.3.

7.5 CVSS 3.1 High EPSS 0.57% · top 55.1% CWE-295 · Improper certificate validationCWE-522 · Insufficiently protected credentials Awaiting Analysis
7.5CVSS 3.1 base score
0.57%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
9References
8 Sep 2026Last modified by NVD

Description

MariaDB Connector/Node.js is used to connect applications developed on Node.js to MariaDB and MySQL databases. Prior to versions 3.3.3, 3.4.6, and 3.5.3, when ssl is enabled without a pinned CA or server certificate, MariaDB Connector/Node.js sends credentials before completing certificate fingerprint validation. In lib/cmd/handshake/auth/handshake.js, a server that selects mysql_clear_password as the initial authentication plugin can receive the password before the post-TLS identity check. In lib/cmd/handshake/authentication.js, an authentication switch can evaluate the previous plugin instead of the requested target plugin, allowing mysql_clear_password to send the credential first. An active man-in-the-middle can present a self-signed certificate, capture the database password, and use it to authenticate directly even though the connector later rejects the server and closes the connection. This issue is fixed in versions 3.3.3, 3.4.6, and 3.5.3.

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

References

LinkTags
https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/514576a5a1fab3ea8498613e259a0b7a764e7302
https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/c47d7275835c78c7eb8186cd23e9d57c045c128b
https://github.com/mariadb-corporation/mariadb-connector-nodejs/commit/ecd36958e6e3bf0e0fa8389546f50c0ed6dbb2ac
https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.3.3
https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.4.6
https://github.com/mariadb-corporation/mariadb-connector-nodejs/releases/tag/3.5.3
https://github.com/mariadb-corporation/mariadb-connector-nodejs/security/advisories/GHSA-cqhc-2h57-wpxf
https://hackerone.com/reports/3777370
https://jira.mariadb.org/browse/CONJS-349

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Source: NIST National Vulnerability Database (record CVE-2026-55215), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.