Cleartext transmission of sensitive information in mariadb-connector-r2dbc
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- High · None · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-319.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| MariaDB | mariadb-connector-r2dbc | before 1.4.1 | 1.4.1 | Patch available | CNA |
| org.mariadb | r2dbc-mariadb | before 1.4.1 | 1.4.1 | Patch available | CNA |
| — | org.mariadb:r2dbc-mariadb (Maven) | before 1.4.1 | 1.4.1 | Patch available | GHSA-c857-9x2m-cvh2 |
- mariadb-connector-r2dbc VendorMariaDB Affected before 1.4.1 Fixed in 1.4.1 Patch available CNA
- r2dbc-mariadb Vendororg.mariadb Affected before 1.4.1 Fixed in 1.4.1 Patch available CNA
- org.mariadb:r2dbc-mariadb (Maven) Vendor— Affected before 1.4.1 Fixed in 1.4.1 Patch available GHSA-c857-9x2m-cvh2
Remediation
- Fix · CNA mariadb-connector-r2dbc (mariadb-corporation) Fixed in 1.4.1
- Fix · CNA r2dbc-mariadb (org.mariadb) Fixed in 1.4.1
- Fix · GHSA-c857-9x2m-cvh2 org.mariadb:r2dbc-mariadb (Maven) Fixed in 1.4.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-55860
- 2026-10-03 Alias added: GHSA-c857-9x2m-cvh2
References
Other 6
- https://github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisories/GHSA-c857-9x2m-cvh2
- https://github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/be786603ec5530414996d2396157013e095b320a
- https://hackerone.com/reports/3784556
- https://github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1
- https://jira.mariadb.org/browse/R2DBC-115
- https://github.com/mariadb-corporation/mariadb-connector-r2dbc
More MariaDB vulnerabilities
- TI-2023-11776 MariaDB v10.5 was discovered to contain a remote code execution (RCE) vulnerability via… CVSS 3.1CRITICAL 9.8
- TI-2016-05707 Oracle MySQL through 5.5.52, 5.6.x through 5.6.33, and 5.7.x through 5.7.15; MariaDB… CVSS 3.0CRITICAL 9.8
- TI-2022-00687 Infinite loop in BN_mod_sqrt() reachable when parsing certificates CVSS 3.1HIGH 7.5
- TI-2014-00217 OpenSSL before 0.9.8za, 1.0.0 before 1.0.0m, and 1.0.1 before 1.0.1h does not properly… CVSS 3.1HIGH 7.4
- TI-2014-00188 The dtls1_reassemble_fragment function in d1_both.c in OpenSSL before 0.9.8za, 1.0.0… CVSS 2.0MEDIUM 6.8
- TI-2018-15259 zlib before 1.2.12 allows memory corruption when deflating (i.e., when compressing) if… CVSS 3.1HIGH 7.5
Sources
- CVE-2026-55860 · CVE Program
- CVE-2026-55860 · NVD
- FIRST EPSS
- GHSA-c857-9x2m-cvh2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences