Connector/C 3.3.20 Release Notes

Release notes for MariaDB Connector/C 3.3.20, a Stable (GA) release published 13 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: 13 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 10.6.28 and 10.11.19.

• MariaDB Connector/C 3.3.20 was shipped within MariaDB Server releases (such as MariaDB Server 10.6) and was not published as an independent standalone package. Connector/C 3.3.21 is the standalone release incorporating all fixes and improvements from 3.3.20 and 3.3.21.

Issues Fixed

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

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

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

• CONC-834: Fix poll timeout reset loop on EINTR signals

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

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

• 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-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.

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