> 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/community-server/old-releases/10.5/10.5.21.md).

# MariaDB 10.5.21 Release Notes

MariaDB 10.5.21 is a Stable (GA) release of MariaDB Community Server 10.5, released on 2023-06-07

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<p align="center">The most recent release of MariaDB 10.5 is:</p>

<h4 align="center"><a href="/docs/release-notes/community-server/old-releases/10.5/10.5.29.md"><strong>MariaDB 10.5.29</strong></a> Stable (GA) <a href="https://mariadb.com/downloads/" class="button primary">Download Now</a></h4>

<p align="center"><a href="https://downloads.mariadb.org/mariadb/10.5.29/"><sub><em>Alternate download from mariadb.org</em></sub></a></p>
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<a href="https://downloads.mariadb.org/mariadb/10.5.21/" class="button primary">Download</a> <a href="/docs/release-notes/community-server/old-releases/10.5/10.5.21.md" class="button secondary">Release Notes</a> <a href="/docs/release-notes/community-server/changelogs/changelogs-mariadb-105-series/mariadb-10-5-21-changelog.md" class="button secondary">Changelog</a> <a href="/docs/release-notes/community-server/old-releases/10.5/what-is-mariadb-105.md" class="button secondary">Overview of 10.5</a>

**Release date:** 7 Jun 2023

[MariaDB 10.5](/docs/release-notes/community-server/old-releases/10.5/what-is-mariadb-105.md) is a previous *stable* series of MariaDB, [maintained until](https://mariadb.org/about/#maintenance-policy) June 2025. It is an evolution of [MariaDB 10.4](/docs/release-notes/community-server/old-releases/10.4/what-is-mariadb-104.md) with several entirely new features not found anywhere else and with backported and reimplemented features from MySQL.

[MariaDB 10.5.21](/docs/release-notes/community-server/old-releases/10.5/10.5.21.md) is a [***Stable (GA)***](/docs/release-notes/community-server/about/release-criteria.md) release.

Thanks, and enjoy MariaDB!

## Notable Items

### InnoDB

* Server crashes in st\_join\_table::choose\_best\_splitting ([MDEV-31403](https://jira.mariadb.org/browse/MDEV-31403))
* Crash with condition pushable into derived and containing outer reference ([MDEV-31240](https://jira.mariadb.org/browse/MDEV-31240))
* InnoDB does not free UNDO after the fix of [MDEV-30671](https://jira.mariadb.org/browse/MDEV-30671) ([MDEV-31234](https://jira.mariadb.org/browse/MDEV-31234))
* Revert "[MDEV-30473](https://jira.mariadb.org/browse/MDEV-30473) : Do not allow GET\_LOCK() / RELEASE\_LOCK() in cluster"

### Optimizer

* Crash with condition pushable into derived and containing outer reference ([MDEV-31403](https://jira.mariadb.org/browse/MDEV-31403) [MDEV-31240](https://jira.mariadb.org/browse/MDEV-31240))
* Crash with [EXPLAIN EXTENDED](/docs/server/reference/sql-statements/administrative-sql-statements/analyze-and-explain-statements/explain.md) for multi-table update of system table ([MDEV-31224](https://jira.mariadb.org/browse/MDEV-31224))

### Security

* Fixes for the following [security vulnerabilities](/docs/server/security/cve.md):
  * CVE-`-``#`

## Changelog

For a complete list of changes made in [MariaDB 10.5.21](/docs/release-notes/community-server/old-releases/10.5/10.5.21.md), with links to detailed information on each push, see the [changelog](/docs/release-notes/community-server/changelogs/changelogs-mariadb-105-series/mariadb-10-5-21-changelog.md).

## Contributors

For a full list of contributors to [MariaDB 10.5.21](/docs/release-notes/community-server/old-releases/10.5/10.5.21.md), see the [MariaDB Foundation release announcement](https://mariadb.org/mariadb-10-11-4-10-10-5-10-9-7-10-6-14-10-5-21-10-4-30-now-available/).

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Be notified of new MariaDB Server releases automatically by [subscribing](https://lists.mariadb.org/postorius/lists/announce.lists.mariadb.org/) to the MariaDB Foundation community announce 'at' lists.mariadb.org announcement list (this is a low traffic, announce-only list). MariaDB plc customers will be notified for all new releases, security issues and critical bug fixes for all MariaDB plc products thanks to the Notification Services.

MariaDB may already be included in your favorite OS distribution. More information can be found on the [Distributions which Include MariaDB](/docs/general-resources/distributions-including-mariadb.md) page.
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