MariaDB Connector/R2DBC: Cleartext password disclosure to a man-in-the-middle server (clear-text auth plugins not gated on a secure transport)
Published Aug 28, 2026
5.9
MEDIUMCVSS 3.1
EPSS 0.23%
Description
MariaDB Connector/R2DBC is a non-blocking MariaDB and MySQL client implemented in Java. Prior to 1.4.1, org.mariadb:r2dbc-mariadb does not gate clear-text password authentication plugins on transport encryption because the AuthenticationPlugin interface has no capability for a plugin to require a secure connection. A hostile or man-in-the-middle MariaDB server can send an AuthSwitchRequest naming mysql_clear_password or dialog (PAM) over a plain-TCP unencrypted connection, and AuthenticationFlow permits ClearPasswordPluginFlow or PamPluginFlow to return the user's password as cleartext bytes on the wire. The disclosed credentials can subsequently be used to authenticate directly to the database server. This issue is fixed in version 1.4.1.
Affected products
-
- Version < 1.4.1StatusaffectedConstraints-
- Version
-
- Version < 1.4.1StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mariadb-Corporation | Mariadb-Connector-R2dbc | n/a |
| ||||||
| Org.mariadb | R2dbc-Mariadb | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Aug 31, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Aug–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.23% (0.00228) | 12.30th | v5 (v2026.06.15) |
| Aug 29, 2026 | 0.12% (0.00120) | 2.06th | v5 (v2026.06.15) |
References (6)
- https://github.com/advisories/GHSA-c857-9x2m-cvh2 Advisory
- https://github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/be786603ec5530414996d2396157013e095b320a x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1 x_refsource_MISC
- https://github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-c857-9x2m-cvh2 x_refsource_CONFIRM
- https://hackerone.com/reports/3784556 x_refsource_MISC
- https://jira.mariadb.org/browse/R2DBC-115 x_refsource_MISC
| Link | Providers | Tags |
|---|---|---|
| https://github.com/advisories/GHSA-c857-9x2m-cvh2 | Advisory | |
| https://github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/be786603ec5530414996d2396157013e095b320a | x_refsource_MISC | |
| https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1 | x_refsource_MISC | |
| https://github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-c857-9x2m-cvh2 | x_refsource_CONFIRM | |
| https://hackerone.com/reports/3784556 | x_refsource_MISC | |
| https://jira.mariadb.org/browse/R2DBC-115 | x_refsource_MISC |
Change history (0)
No recorded changes yet.