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Release date: 21 Nov 2025

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Notable Items

• Included in MariaDB Community Server , and

Summary

This release includes internal improvements to the build system and continuous integration setup. There are no user-facing changes, bug fixes, or new features in this version.

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

Release date: 21 Aug 2025

This is a release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Release date: 9 Apr 2025

This is a release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

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Release date: 21 Jun 2024

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Issues fixed:

• : Don't allow to use unsupported client flags in mysql_real_connect

• : Fix memory leak when setting default configuration directories

• : Don't trust error packets received prior to TLS handshake completion. (Kudos to Daniel Lenski for his contribution

Notable changes

• Allow named pipe connection handle to be used with IO completion port. Pipe handle can be obtained via mysql_get_socket() API function. Added support for zstd static library (Kudos to Uilian Ries for his contribution)

• Added support for restricted_auth in configuration files

• - Server now permits to send a result-set containing generated id and affected rows for each bulk operation. This feature can be enabled with option MARIADB_OPT_BULK_UNIT_RESULTS. The server indicates if this feature is supported by setting MARIADB_CLIENT_BULK_UNIT_RESULTS in his capability flags.

Contributions

• Warning fixes (-Wcalloc-transposed-args) in calloc calls (Thanks to Sam James)

• Fixed SSL_read/write return value check in ma_tls_async_check_result (Thanks to Josh Hunt)

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

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Release date: 25 May 2022

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Notable changes

• Updated bundled zlib (Version 1.2.12)

• : License header fixes

• : Save proxy settings on reconnect

• Android build fix

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

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Release date: 19 Feb 2024

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Notable changes

• Allow named pipe connection handle to be used with IO completion port. Pipe handle can be obtained via mysql_get_socket() API function.

• Added support for zstd static library (Kudos to Uilian Ries for his contribution)

Issues fixed:

• : Don't trust error packets received prior to TLS handshake completion. (Kudos to Daniel Lenski for his contribution)

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

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Release date: 7 Feb 2023

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Issues fixed:

• : Don't substitute parameters in server error message

• : Fix memory leak in prepared statements if realloc failed

• : Fixed error numbers

• : Check error code ranges and provide support for variadic arguments in prepared statement errors.

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

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Release date: 29 Nov 2023

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Issues fixed:

• : Fix memory allocation issue with prepared statement reexecution

• : Build fix for Win32

• : Cache bcrypt algorithm providers (Windows)

• : Initialize time struct in pvio_socket_set_timeout

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

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Release date: 12 Nov 2024

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

MariaDB Connector/C 3.3.12 was not released separately but is included in MariaDB Community Server 10.6.20, 10.11.10, and 11.2.6. MariaDB Connector/C 3.3.13 includes additional bug fixes for the Connector.

Notable changes

• Added TLSv1.3 support for Schannel (Windows)

• Added new option -DWITH_BOOST_CONTEXT. CMake option -DWITH_BOOST_CONTEXT=ON adds boost::context as a dependency of libmariadb to provide a fallback on non-natively supported architectures. boost::context is preferred over ucontext when both are available.

Issues fixed:

• Fixed possible crash if not default plugin was loaded.

• : Undefined behavior in the reference ed25519 implementation

• : Fixed error "SEC_E_ALGORITHM_MISMATCH" connecting Windows client to Ubuntu

• : A reconnect doesn't do node failover when using a connection string with multiple hosts

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

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Release date: 20 Aug 2024

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Issues fixed:

• : parse_connection_string ignores empty string in last parameter

• : Replace COM_PROCESS_KILL by KILL command

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

Release date: This version was never released

Release date: 11 Feb 2025

This is a release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Release date: 7 Nov 2022

This is a release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

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Release date: 14 Sep 2023

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Notable changes

• : Added XID support for GTID_EVENT (replication/binlog API)

Issues fixed:

• removed server certification flag from client capabilities (this is a client only option)

• : Fixed crash when receiving ROWSv2 (MySQL Server) event. Kudos to Sruli Ganor for reporting this issue and providing a fix. (replication/binlog API)

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

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Release date: 22 May 2023

This is a Stable (GA) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

Notable changes

• Updated bundled zlib library (version 1.2.13)

• : Added support for all binary log events (replication/binlog API).

• : Support of semi-sync replication

• : Build named pipe plugin as built-in plugin (Windows)

Issues fixed:

• : Checksum verification (replication/binlog API).

• : Fixed NULL pointer dereference in unpack_fields().

• : Clear server status and remove pending result sets in mysql_reset_connection().

• : If prepare step failed in mariadb_stmt_execute_direct now both mysql_stmt_error and mysql_error return the error message from prepare step instead of error message of execute.

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

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Release date: 15 Feb 2022

This is a Release Candidate (RC) release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.

New features

Restrict authentication plugins ()

Added new option MARIADB_OPT_RESTRICTED_AUTH (and corresponding "restricted-auth" option for configuration files) which specifies on or more comma spearated authentication plugins which are allowed for authenication.

If the server asks for an authentication plugin not listed in this option the connect attempt will fail with error CR_PLUGIN_NOT_ALLOWED.

ZStandard compresion support

Zstd compression is now supported for connections to a MySQL Server 8.0 or newer. Compression algorithms are now provided via plugins. If the Zstd compression plugin is not part of a downloaded package it means, that zstd is not installed by default on this platform. In this case you have to install the zstd libraries and include files and build the plugin from source.

Support for semi synchronous replication ()

Beside already supported asynchronous replication the replication/binlog API now supports semi synchronous replication.

Failover capabilities ()

host parameter of mysql_real_connect (and corresponding configuration settings MYSQL_OPT_HOST for mysql_options() api call and host key in configuration files) now accepts to specify multiple hosts and ports.

When establishing a connection, the list of specified hosts is run through until a connection can be established. If no connection can be established to any of the specified hosts, an error is returned.

MARIADB_CONNECTION_BYTES_READ and MARIADB_CONNECTION_BYTES_SENT

mariadb_get_infov now supports options MARIADB_CONNECTION_BYTES_READ and MARIADB_CONNECTION_BYTES_SENT to obtain the bytes sent or read to/from database server.

Connection string support ()

A connection string contains key/value pairs, separated by a semicolon as used in ODBC. Supported keys are all configuration options which can be used in MariaDB configuration files. For a complete list check .

The connection string must contain at least one semicolon, otherwise it wil be interpreted as hostname. Unknown or invalid keys will be ignored.

To connect via connection string, the following methods might be used:

• by specifing connection option in configuration file:

• by using mariadb_connect() macro

• by passing connection string in host parameter to mysql_real_connect

Bugs fixed

• : rotate as first event isn't handled correctly (replication/binlog api)

Changelog

For a list of changes made in this release, with links to detailed information on each push, see the .

Release date: 22 Aug 2022

This is a release of MariaDB Connector/C, formerly known as MariaDB Client Library for C.