ProxySQL 4.0.7 Release Notes

Release date: 2026-04-07

ProxySQL 4.0.7 is a maintenance release for the AI/MCP Tier, incorporating all improvements from ProxySQL 3.1.7 and 3.0.7 while adding MCP stack refinements and expanded AI-driven testing infrastructure. This version is built using PROXYSQLGENAI=1 (which implies PROXYSQL31=1) and requires the Rust toolchain.

Release commit: d7a26b79e936557e2d198148ce6d09111210d651

Highlights (AI/MCP Tier)

• MCP Bearer Token Fix: Fixed MCP Bearer token authentication test to align with case-insensitive token comparison as specified in the MCP specification.
• AI Testing Infrastructure: Migrated AI-specific TAP tests to the unified CI infrastructure pattern, enabling automated testing of AI/MCP features alongside core proxy functionality.
• FFTO Enabled by Default: FFTO remains enabled by default in 4.0.x, providing full traffic observability out of the box including the new error recording capabilities.

New Features (4.0.x)

MCP Stack Refinements

MCP Bearer Token Authentication (6d6015a)
Fixed the MCP Bearer token test to properly validate case-insensitive token comparison as defined in the MCP specification. The authentication middleware now correctly accepts tokens regardless of case, improving compatibility with various MCP client implementations.

AI Testing Infrastructure

Unified CI Migration (0b9806c, 2f8e63c)
Migrated the AI-specific TAP test group to the unified CI infrastructure pattern. This consolidates AI/MCP test execution with the core ProxySQL test pipeline, enabling parallel execution, better resource utilization, and consistent test reporting across all product tiers.

Features Inherited from v3.1.7 (Innovative Tier)

ProxySQL 4.0.7 includes all features from the v3.1.7 (Innovative) release, including:

• FFTO Error Recording: MySQL and PostgreSQL errors from fast-forwarded traffic are now captured in stats_mysql_errors and stats_pgsql_errors (#5539).
• FFTO Default Behavior: FFTO remains enabled by default in 4.0.x, providing full traffic observability without additional configuration (#5539).
• Comprehensive FFTO E2E Tests: Full E2E test coverage for FFTO across MySQL and PostgreSQL protocols (#5516, #5517).
• TSDB Improvements: Fixed TSDB test infrastructure for Docker-based CI environments.

Features Inherited from v3.0.7 (Stable Tier)

ProxySQL 4.0.7 includes all features from the v3.0.7 (Stable) release, including:

• Protocol Safety: Hardened MySQL protocol handling for COM_CHANGE_USER, HandshakeResponse, and PROXY protocol v1 (#5556).
• zstd Compression: Native zstd compression support for the MySQL protocol.
• TLS Observability: stats_tls_certificates table and stats_proxysql_global table for TLS certificate tracking and global metrics.
• SHOW WARNINGS Fix: Correct warning_count handling for statements with inline comments (#5306).
• REST API: Configuration-based route loading and hardened config handling.
• Security: Admin credential redaction in logs and Dependabot alert remediation.

For a detailed list of these core improvements, please refer to the ProxySQL 3.0.7 Release Notes.

Contributors

ProxySQL is a community-driven project, and we are grateful to all the contributors who helped make this release possible. A special thank you to:

• @rahim-kanji for PostgreSQL protocol hardening and FFTO error recording.
• @YujiHatakeyama for the SHOW WARNINGS fix with inline comments (#5306).

We also thank everyone who reported bugs, tested experimental features, and provided feedback during this release cycle.

Hashes

The release commit is: d7a26b79e936557e2d198148ce6d09111210d651

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