CVE-2026-55860 json
MariaDB Connector/R2DBC: Cleartext password disclosure to a man-in-the-middle server (clear-text auth plugins not gated on a secure transport)
published 2026-08-28 2 mo ago modified 2026-09-08 2 mo ago also GHSA-c857-9x2m-cvh2 , EUVD-2026-68023
- cvss
- 5.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 13%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- maven org.mariadb:r2dbc-mariadb 1.4.1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 mo ago
Exploit prediction
0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
| GitHub | 3.1 | 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| maven | org.mariadb:r2dbc-mariadb | <1.4.1 |
1.4.1 |
Affected products
- mariadb-corporation mariadb-connector-r2dbc
- org.mariadb r2dbc-mariadb
Classification
References
-
github.com
/mariadb-corporation/mariadb-connector-r2dbc/commit/be786603ec5530414996d2396157013e095b320a
web
-
github.com
/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-c857-9x2m-cvh2
web
-
hackerone.com
/reports/3784556
web
-
github.com
/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1
web
-
jira.mariadb.org
/browse/R2DBC-115
web
-
github.com
/mariadb-corporation/mariadb-connector-r2dbc
package
Sources
- CVE List CVE-2026-55860
- GitHub Advisory GHSA-c857-9x2m-cvh2
- NVD CVE-2026-55860
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