Release date: 21 Aug 2025

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

Notable Items

• Included in MariaDB Community Server , , , and

Issues Fixed

• : Fix potential loss of "Proxy header not accepted from host" error

• : TLS v1.3 support for Windows Server

• : Enable rpl_set_error

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 19 Feb 2024

This is a 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 .

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 7 Jul 2021

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

For a description of this library see the page.

Notable changes

• First stable (GA) release in the Connector/C 3.2 series

• : Allow all curves when specifying cipher suite (GnuTLS)

• : Add support for OpenSSL 3.0

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 9 Apr 2025

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

Issues Fixed

• : Valid named pipe connection on Windows is closed. Fixed different behavior of pvio_is_alive (which was first used with fix of ). Both for sockets and named pipe the function now returns true if the connection is alive, otherwise false

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 21 Nov 2025

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

Release date: 24 June 2022

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

Notable changes

TLS encryption

: Provide X509 peer certificate information:

Added a new structure MARIADB_X509_INFO, which contains information about peer certificate. The information can be obtained via mysql_get_infov API function:

: enable MYSQL_OPT_SSL_VERIFY_SERVER_CERT by default

Using TLS/SSL has been simplified with MariaDB Server 11.4. Before version 11.4, proper TLS/SSL configuration required multiple manual steps for the server and all the clients connecting to it.

For MariaDB Connector/C before 3.4 to establish an TLS/SSL encrypted connection, or a MariaDB Server release series previous to 11.4, three options can be used:

- 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.

• Added support for restricted_auth in configuration files

• Support for new collations which were added in MariaDB Server 11.5

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 : Check pending results when closing statement : mariadb_rpl_fetch() crashes if table is partitioned

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 .

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 11 Feb 2025

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

Notable changes

• Added support for setting zstd compression level via mysql_optionsv parameter MYSQL_OPT_ZSTD_COMPRESSION_LEVEL.

Issues fixed:

• : Fix SSL_read/write return value checking in ma_tls_async_check_result (Kudos to Joshua Hunt for contributing this fix)

• : First query fails after reconnect

• : Ubsan and Asan fixes

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 21 Jun 2024

This is a 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 .

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 25 May 2022

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

For a description of this library see the page.

Notable changes

• : Allocate memory for proxy options

• : Handle alerts after tls handshake has completed (OpenSSL)

• : Fixed license header

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 15 Feb 2022

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

For a description of this library see the page.

Notable changes

• : FIx detection of MariaDB Server: If the server was startet with --version option, it might not contain the 5.5.5 prefix

• : Add mariadb_config --libmysqld-libs option. If server package was built with embedded server and MariaDB Connector/C was built as subproject in server package mariadb_config will display link option for embedded server

• : create libmariadb.a as symlink to libmariadbclient.a

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 29 Nov 2023

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

For a description of this library see the page.

Issues fixed:

• : Fix memory allocation issue with prepared statement reexecution.

• : Win32 build fix

• : Cache bcrypt algorithm providers (Windows)

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 21 Aug 2025

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

Notable Items

• Included in MariaDB Community Server , and

Issues Fixed

• : Fix potential loss of "Proxy header not accepted from host" error

• : TLS v1.3 support for Windows Server

• : Enable rpl_set_error

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 7 Feb 2023

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

For a description of this library see the page.

Notable changes

mysql_get_client_info()/mysql_get_client_version() now return the Connector/C specific version (instead of corresponding server version),

Issues fixed:

• : Don't substitute parameters in server error message

• : Fix memory leak in prepared statements if realloc failed

• : Fixed error numbers

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 9 Apr 2025

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

For a description of this library see the page.

Issues fixed:

• : Valid named pipe connection on Windows is closed. Fixed different behavior of pvio_is_alive (which was first used with fix of ). Both for sockets and named pipe the function now returns true if the connection is alive, otherwise false

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 11 Feb 2025

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

For a description of this library see the page.

Issues fixed:

• : Fix SSL_read/write return value checking in ma_tls_async_check_result (Kudos to Joshua Hunt for contributing this fix)

• : First query fails after reconnect

• : Fix crash when sending NULL_LENGTH in field description

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 1 Sep 2023

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

For a description of this library see the page.

Issues fixed:

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

• build fixes

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: This version was never released

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 26 Apr 2016

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

For a description of this library see the page.

Notable Bug fixes

• : fix crash when fetching MYSQL_TYPE_BIT data. MYSQL_TYPE_BIT has no fixed packlength, so net_field_length should be checked instead.

• : Memory corruption in mariadb_dyncol_unpack

• : String conversion of timestamps is broken: When converting datetime value with microseconds to string (binary protocol) number of decimal places was ignored. Thanks to Patrick Huesmann for providing a fix.

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 6 Jun 2019

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

For a description of this library see the page.

Bug fixes

• : Changed order for lookup configuration files on Windows

• : Added support for pem files which contain certificate and private key.

• : Allow TLS version 1.2 when using SChannel (Windows)

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 12 Dec 2019

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

For a description of this library see the page.

Notable Bug fixes and Changes

• : ERROR 2026 (HY000): SSL connection error: Certificate signature check failed

• : Provide error code and message for Schannel errors

• / / : SEC_E_INVALID_TOKEN when server sends large message during SSL handshake

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 25 May 2022

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

For a description of this library see the page.

Notable changes

• : Allocate memory for proxy options

• : Handle alerts after tls handshake has completed (OpenSSL)

• : Fixed license header

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 4 Aug 2016

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

For a description of this library see the page.

New features

• Added support for OpenSSL 1.1 library

Notable Bug fixes

• : Fixed wrong behaviour of mysql_stmt_fetch_column: If a blob is fetched in pieces, offset was ignored.

• : When retrieving large result sets mysql_stmt_store_result was 4 times slower than libmysql due to extra loops in alloc_root() function. (see also )

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 2 Aug 2018

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

For a description of this library see the page.

Notable Bug fixes

• : FIx IS_NUM() macro

• Coverity scan bug fixes

• : local infile parameter must be unsigned int instead of my_bool

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 11 Sep 2019

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

For a description of this library see the page.

Notable Changes

• : Use windows crypto libraries on Windows platforms

• Included in , , and

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 1 Aug 2019

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

For a description of this library see the page.

Bug fixes

• : Fix CMake warnings

• : heap-use-after-free in client_mpvio_read_packet

• : Fix GnuTLS error with TLSv1.3

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 23 Feb 2021

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

For a description of this library see the page.

Bugs Fixed

• : Fix warnings generated during compilation of plugin/auth_pam/testing/pam_mariadb_mtr.c on FreeBSD

• : Fixed warning on MacOS when including ucontext.h

• : Check if mysql->options.extension was allocated before checking async_context

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

Release date: 19 Jun 2019

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

For a description of this library see the page.

Bug fixes

• : client plugins can't be loaded due to missing prefix

• Fixed version setting in GnuTLS by moving "NORMAL" at the end of priority string

Changelog

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

_{This page is licensed: CC BY-SA / Gnu FDL}

MariaDB Connector/C 3.2 is the current major development version. MariaDB Connector/C 3.1 is stable and feature-complete, so major new features to be developed are going into 3.2.

New Features

• : Do not resend prepared statement metadata unnecessarily

• : Added support for passwords > 255 characters

• LOAD DATA LOCAL is now supported in binary protocol

Notable changes:

• The connection plugin "aurora" was removed

• Default character set is now utf8mb4

• Character set utf8 will be mapped to utf8mb3

_{This page is licensed: CC BY-SA / Gnu FDL}