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ClickHouse® is a real-time analytics database management system

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Click House v26.9.20.23-stable

Click House: v26.9.20.23-stable Release

Release date:

October 16, 2026

Previous version:

v26.9.19.9-stable (released October 14, 2026)

Magnitude:

221 Diff Delta

Contributors:

1 total committer

Data confidence:

Commits:

23 Commits in this Release

Ordered by the degree to which they evolved the repo in this version.

Backport #124255 to 26.9: Bump vendored `expat` from 2.8.2 to 2.9.0

Authored October 14, 2026

Backport #124453 to 26.9: Add S3 bucket to `remote_url_allow_hosts`

Authored October 14, 2026

Backport #119368 to 26.9: Do not deserialize unexpected packets in TCPHandler

Authored October 14, 2026

Backport #120887 to 26.9: Reject deeply nested JSON documents instead of overflowing the stack

Authored October 15, 2026

Backport #125900 to 26.9: Fix stack overflow in the CapnProto schema compiler on long chains of declarations

Authored October 15, 2026

Backport #124930 to 26.9: Fix ATTACH for S3 disks created without 'remote_url_allow_hosts

Authored October 14, 2026

Backport #123133 to 26.9: Require permission to override named collections

Authored October 15, 2026

Backport #125512 to 26.9: Never stop the server process from the line editor of the embedded client

Authored October 14, 2026

Backport #125774 to 26.9: Bump `vectorscan` from 5.4.11 to 5.4.13

Authored October 14, 2026

Backport #125760 to 26.9: Allow vertical merge into non-wide parts

Authored October 15, 2026

Backport #125712 to 26.9: Stream-parse the `.backup` metadata file

Authored October 14, 2026

Backport #125221 to 26.9: Fix `ORDER BY ... 0

Authored October 16, 2026

Backport #126032 to 26.9: Carry the configured name on a cluster built from a host list

Authored October 15, 2026

Backport #122128 to 26.9: materializeBlock: instantiate type-only header columns before materializing

Authored October 15, 2026

Backport #125575 to 26.9: Do not eliminate aggregators of `GROUPING SETS` keys with `group_by_use_nulls`

Authored October 14, 2026

Backport #125661 to 26.9: Validate `rabbitmq_routing_key_list` in the `RabbitMQ` engine

Authored October 14, 2026

Update autogenerated version to 26.9.19.9 and contributors

Authored October 14, 2026

Backport #125463 to 26.9: Revert "Push filters below WindowStep on PARTITION BY columns"

Authored October 14, 2026

Backport #120355 to 26.9: Reduce Lock Contention on Shared Context Mutex

Authored October 14, 2026

Backport #119510 to 26.9: Bump `mariadb-connector-c` to v3.4.10

Authored October 14, 2026

Backport #125487 to 26.9: Fix CapnProto schema depth check bypass through comments and backtick text lines

Authored October 14, 2026

Backport #122756 to 26.9: Fix `CANNOT_READ_ALL_DATA` in subcolumn size estimation for an empty Wide part

Authored October 15, 2026

Backport #125505 to 26.9: Fix a possible segmentation fault in `AvroConfluent` when reading an Avro `map` into a `Map` column

Authored October 15, 2026

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