> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/release-notes/galera-cluster/26.4/26.4.27.md).

# Galera 26.4.27 Release Notes

**Release Date:** 2026-05-12

MariaDB is pleased to announce the release of Galera Replication library 4.27, implementing wsrep API version 26.

The library is available as targeted packages and package repositories for a number of Linux distributions, including Debian 11 (Bullseye), and 12 (Bookworm), 22.04 LTS (Jammy), and 24.04 LTS (Noble), RHEL 8, and 9. Obtaining packages using a package repository removes the need to download individual files and facilitates the deployment and upgrade of Galera nodes.

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This and future releases will be available from <https://mariadb.com/galera-downloads/>
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## Notable changes

* Fixed issue where write set buffers were released too early causing failure on IST with message "IST didn't contain all write sets, expected last : last received: ".

## Known Issues

* In order to install Galera package on RHEL 8, MySQL and MariaDB modules need to be disabled first with `dnf -y module disable mysql mariadb`.

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