Connector/R2DBC 1.4.2 Release Notes

Connector/R2DBC 1.4.2 is a Stable (GA) release of MariaDB Connector/R2DBC, released on 2026-09-02

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Overview

MariaDB Connector/R2DBC is a non-blocking interface between Java applications and MariaDB Server. MariaDB Connector/R2DBC enables the development of Java 8+ applications for MariaDB database products.

Release date: 2 Sep 2026

MariaDB Connector/R2DBC 1.4.2 is a Stable (GA) release.

Notable Changes

• R2DBC-128 New maxAllowedPacket connection parameter, which sets the maximum size in bytes of a packet the connector sends or accepts. When the parameter is set, the value is advertised to the server during the handshake, commands larger than the value are rejected before being sent, and oversized packets received from the server are rejected. When the parameter is not set, the connector applies no limit to what it sends, and accepts packets up to a quarter of the JVM maximum heap size, clamped between 16 MB and 1 GB. Until authentication completes, a fixed 1 MB limit always applies to received packets.

• Added the Netty kqueue native transport for Apple Silicon (osx-aarch_64).

Bugs Fixed

• R2DBC-127 Multipart packets larger than 16 MB are now rejected before authentication, so that a rogue server cannot exhaust client memory before authentication completes.

• R2DBC-129 The PBKDF2 iteration factor sent by the server for parsec authentication is now bounded by the connectTimeout value, and key derivation runs off the event loop.

• R2DBC-131 The connector now closes the connection when the server sends a response that does not correspond to a command.

• Connection.close() no longer fails when the QUIT packet cannot be sent.

• Fixed a possible NullPointerException in connection configuration and in client_ed25519 authentication.

Changelog

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

Resources

• Download

• Documentation

• Install MariaDB Connector/R2DBC

• Install MariaDB Connector/R2DBC with Spring Data

• Report Issues

• Source code

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