Connector/C 3.4.10 Release Notes

Release notes for MariaDB Connector/C 3.4.10, a Stable (GA) release published 24 August 2026.

The most recent release of MariaDB Connector/C is: 3.4.11

Download Connector/C 3.4.11

Download Release Notes Changelog About MariaDB Connector/C

Release date: 24 Aug 2026

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

For a description of this library see the MariaDB Connector/C page.

Notable Items

• Included in MariaDB Community Server 11.4.13, 11.8.9, and 12.3.3

• Enable schannel async, unify synchronous and asynchronous IO

• MariaDB Connector/C 3.4.10 was shipped within MariaDB Community Server releases and was not published as an independent standalone package; Connector/C 3.4.11 is the standalone release incorporating all fixes and improvements from 3.4.10 and 3.4.11

Issues Fixed

• CONC-813, CONC-814: Fix UBSan errors (Thanks to Michael Schorm for contribution)

• CONC-817: Cmake cleanup (Thanks to Michael Schorm for contribution)

• CONC-818: report CR_SERVER_LOST on TLS connection close (Thanks to Michael Schorm for contribution)

• CONC-820: Clamp server-provided field lengths to maximum bounds (reported by fg0x0)

• CONC-825: Fix unaligned pointer cast in int2store macro

• CONC-826: don't revalidate certificate after COM_CHANGE_USER

• CONC-827,CONC-829: Fix overflows and bugs identified by rpl_fuzzer

• CONC-828: Remove pvio blocking/is_blocking methods, always use non-blocking sockets

• CONC-830: Add MARIADB_CLIENT_PLUGIN_EXPORT for zstd compression plugin

• CONC-834: Fix poll timeout reset loop on EINTR signals (Thanks to Shaohua Wang for contribution)

• CONC-835: Fix pre-auth memory exhaustion in packet reassembly

• CONC-838: Fix PBKDF2 CPU stall vulnerability in parsec auth plugin

• CONC-840: Maximum number of result set columns is now limited up to 0xFFFFF (1048575) columns

• CONC-841: Added support for MYSQL_VECTOR field type (ps protocol)

• CONC-842: Fix heap buffer over-read in mthd_my_read_rows

• CONC-843: Throw error for unknown field types (MYSQL_VECTOR) instead of crashing

• CONC-844: OOB read and integer underflow in init_read_hdr() via untrusted dynamic column header

• CONC-846: Auth-switch allows cleartext password leakage on TLS hostname verification failure

• CONC-847: Fix OOB read in unpack_fields() on truncated metadata packet

Changelog

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

Be notified of new MariaDB Server releases automatically by subscribing to the MariaDB Foundation community announce 'at' lists.mariadb.org announcement list (this is a low traffic, announce-only list). MariaDB plc customers will be notified for all new releases, security issues and critical bug fixes for all MariaDB plc products thanks to the Notification Services.

MariaDB may already be included in your favorite OS distribution. More information can be found on the Distributions which Include MariaDB page.

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