# ClickHouse v26.3.21.7-lts — Release v26.3.21.7-lts

- Product: ClickHouse (https://whatsnew.fyi/product/clickhouse)
- Vendor: ClickHouse
- Date: 2026-08-22
- Version: v26.3.21.7-lts
- Original notes: https://github.com/ClickHouse/ClickHouse/releases/tag/v26.3.21.7-lts
- Permalink: https://whatsnew.fyi/product/clickhouse/releases/v26.3.21.7-lts
- Labels: Machine-generated from commit messages — the vendor published no release notes

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **fixed** — Fixed nullptr dereference in CREATE TABLE TO INNER UUID without ENGINE.
- **fixed** — Fixed serialization of Map-valued settings in access entities.
- **security** — Validated Iceberg metadata file path for null bytes.
- **fixed** — Fixed CREATE OR REPLACE MATERIALIZED VIEW ... POPULATE losing the source subscription.
- **fixed** — Fixed trivial count optimization being applied when the aggregate argument contains arrayJoin.
- **fixed** — Fixed stripping of injective functions that hide argument nullability inside uniq.