CVE-2026-55860: org.mariadb:r2dbc-mariadb vulnerable to cleartext password disclosure to a man-in-the-middle server (clear-text auth plugins not gated on a secure transport)
The connector does not gate clear-text password authentication plugins on transport encryption. A hostile or man-in-the-middle MariaDB server can request a clear-text plugin over an unencrypted (plain-TCP) connection, and the driver responds with the user’s password in cleartext on the wire.
References
- github.com/advisories/GHSA-c857-9x2m-cvh2
- github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/be786603ec5530414996d2396157013e095b320a
- github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1
- github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-c857-9x2m-cvh2
- hackerone.com/reports/3784556
- jira.mariadb.org/browse/R2DBC-115
- nvd.nist.gov/vuln/detail/CVE-2026-55860
Code Behaviors & Features
Detect and mitigate CVE-2026-55860 with GitLab Dependency Scanning
Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →