v4.3.1

nilbuild/developer-roadmapv4.3.1Jun 20, 2026by github-actions[bot]

AI Summary

A security-focused bug fix release correcting AES-256-GCM encryption operations.

Key Highlights

Add explicit authTagLength for AES-256-GCM cipher operations

New Features

Fixed AES-256-GCM encryption

Full Release Notes

## [4.3.1](https://github.com/punkpeye/fastmcp/compare/v4.3.0...v4.3.1) (2026-06-20)


### Bug Fixes

* add explicit authTagLength for AES-256-GCM cipher operations ([#271](https://github.com/punkpeye/fastmcp/issues/271)) ([9cee786](https://github.com/punkpeye/fastmcp/commit/9cee78608c8e75f7b62d42bc344f99907e74af4f))