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CVE-2026-55858
Published:August 28, 2026
Updated:September 24, 2026
MariaDB Connector/J is used to connect applications developed in Java to MariaDB and MySQL databases. Prior to 2.7.14, 3.3.5, 3.4.3, and 3.5.9, the connector encodes and decodes protocol text and performs client-side escaping under the assumption that the connection character set is UTF-8. The server can report a mid-session change to character_set_client through OK-packet session-state tracking, including a change caused by SET NAMES, a stored routine or trigger, server configuration, or a hostile server. If character_set_client changes to a non-UTF-8 value, the driver continues to read and write UTF-8 while the server interprets the same bytes under another 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 causes SQLException with SQLState 08000 and closes the connection. This issue is fixed in versions 2.7.14, 3.3.5, 3.4.3, and 3.5.9.
Affected Packages
https://github.com/mariadb-corporation/mariadb-connector-j.git (GITHUB):
Affected version(s) >=3.5.0 <3.5.9
Fix Suggestion:
Update to version 3.5.9
https://github.com/mariadb-corporation/mariadb-connector-j.git (GITHUB):
Affected version(s) >=3.4.0 <3.4.3
Fix Suggestion:
Update to version 3.4.3
https://github.com/mariadb-corporation/mariadb-connector-j.git (GITHUB):
Affected version(s) >=3.0.0-alpha <3.3.5
Fix Suggestion:
Update to version 3.3.5
https://github.com/mariadb-corporation/mariadb-connector-j.git (GITHUB):
Affected version(s) >=1.1.8 <2.7.14
Fix Suggestion:
Update to version 2.7.14
org.mariadb.jdbc:mariadb-java-client (JAVA):
Affected version(s) >=3.5.0 <3.5.9
Fix Suggestion:
Update to version 3.5.9
org.mariadb.jdbc:mariadb-java-client (JAVA):
Affected version(s) >=3.0.1-beta <3.3.5
Fix Suggestion:
Update to version 3.3.5
org.mariadb.jdbc:mariadb-java-client (JAVA):
Affected version(s) >=1.1.3 <2.7.14
Fix Suggestion:
Update to version 2.7.14
org.mariadb.jdbc:mariadb-java-client (JAVA):
Affected version(s) >=3.4.0 <3.4.3
Fix Suggestion:
Update to version 3.4.3
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CVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Inappropriate Encoding for Output Context
EPSS
Base Score:
0.34