MariaDB Connector/R2DBC: Inappropriate Encoding for Output Context and Improper Encoding or Escaping of Output in org.mariadb:r2dbc-mariadb

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55859
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 23:17:09 UTC
Updated2026-08-28 23:17:09 UTC
DescriptionMariaDB Connector/R2DBC is a non-blocking MariaDB and MySQL client implemented in Java. Prior to 1.4.1, org.mariadb:r2dbc-mariadb encodes and decodes all character data under the assumption that the connection character set is UTF-8. A server can announce a mid-session change to character_set_client through the OK-packet session-state-tracking mechanism, including through SET NAMES executed by a stored routine or trigger, server configuration, or a hostile or man-in-the-middle server. If the new character set is not UTF-8, the driver continues to exchange UTF-8 while the server interprets the same bytes under a different encoding, causing silent data corruption and a client/server charset-confusion mismatch that can defeat byte-wise quoting or escaping. The fix accepts only utf8, utf8mb3, or utf8mb4 after initialization; any other value raises R2dbcNonTransientResourceException with SQLState 08000 and closes the connection. This issue is fixed in version 1.4.1.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

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

Problem Types: CWE-116 | CWE-838 | CWE-116 CWE-116: Improper Encoding or Escaping of Output | CWE-838 CWE-838: Inappropriate Encoding for Output Context

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mariadb-corporation Mariadb-connector-r2dbc affected < 1.4.1 Not specified
CNA Org.mariadb R2dbc-mariadb affected < 1.4.1 Not specified

References

ReferenceSourceLinkTags
github.com/mariadb-corporation/mariadb-connector-r2dbc/commit/38bad9afeb... [email protected] github.com
jira.mariadb.org/browse/R2DBC-124 [email protected] jira.mariadb.org
github.com/mariadb-corporation/mariadb-connector-r2dbc/security/advisori... [email protected] github.com
github.com/mariadb-corporation/mariadb-connector-r2dbc/releases/tag/1.4.1 [email protected] github.com
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