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sidebar_position: 1
sidebar_label: 2023
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# 2023 Changelog

### ClickHouse release v23.8.6.16-lts (077df679bed) FIXME as compared to v23.8.5.16-lts (e8a1af5fe2f)

#### Bug Fix (user-visible misbehavior in an official stable release)

* Backported in [#54583](https://github.com/ClickHouse/ClickHouse/issues/54583): Fix rare bug in replicated merge tree which could lead to self-recovering `CHECKSUM_DOESNT_MATCH` error in logs. [#54549](https://github.com/ClickHouse/ClickHouse/pull/54549) ([alesapin](https://github.com/alesapin)).
* Backported in [#56253](https://github.com/ClickHouse/ClickHouse/issues/56253): Fixed bug of match() function (regex) with pattern containing alternation produces incorrect key condition. [#54696](https://github.com/ClickHouse/ClickHouse/pull/54696) ([Yakov Olkhovskiy](https://github.com/yakov-olkhovskiy)).
* Backported in [#56322](https://github.com/ClickHouse/ClickHouse/issues/56322): Fix a crash during table loading on startup. Closes [#55767](https://github.com/ClickHouse/ClickHouse/issues/55767). [#56232](https://github.com/ClickHouse/ClickHouse/pull/56232) ([Nikolay Degterinsky](https://github.com/evillique)).
* Backported in [#56292](https://github.com/ClickHouse/ClickHouse/issues/56292): Fix segfault in signal handler for Keeper. [#56266](https://github.com/ClickHouse/ClickHouse/pull/56266) ([Antonio Andelic](https://github.com/antonio2368)).
* Backported in [#56443](https://github.com/ClickHouse/ClickHouse/issues/56443): Fix crash due to buffer overflow while decompressing malformed data using `T64` codec. This issue was found with [ClickHouse Bug Bounty Program](https://github.com/ClickHouse/ClickHouse/issues/38986) by https://twitter.com/malacupa. [#56434](https://github.com/ClickHouse/ClickHouse/pull/56434) ([Alexey Milovidov](https://github.com/alexey-milovidov)).

#### NOT FOR CHANGELOG / INSIGNIFICANT

* Improve enrich image [#55793](https://github.com/ClickHouse/ClickHouse/pull/55793) ([Mikhail f. Shiryaev](https://github.com/Felixoid)).