# ClickHouse v26.7.6.57-stable — Release v26.7.6.57-stable

- Product: ClickHouse (https://whatsnew.fyi/product/clickhouse)
- Vendor: ClickHouse
- Date: 2026-09-01
- Version: v26.7.6.57-stable
- Original notes: https://github.com/ClickHouse/ClickHouse/releases/tag/v26.7.6.57-stable
- Permalink: https://whatsnew.fyi/product/clickhouse/releases/v26.7.6.57-stable
- 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 std::out_of_range when a space-filling curve is not a key column, out-of-bounds read in formatRowNoNewline with empty rows, and out-of-bounds issues in text index posting list deserialization.
- **fixed** — Fixed read_rows/read_bytes/written_rows/written_bytes statistics in system.query_thread_log.
- **fixed** — Fixed KeeperMap metadata compatibility with redundant parentheses and canonicalize KeeperMap primary key metadata writes.
- **fixed** — Fixed unkillable hang when dropping a low-sorting-name TimeSeries table and segfault in expandOrderByAll for a Merge child query.
- **security** — Fixed uninitialized memory exposure in query results, validated aggregate function states on deserialization, and validated Variant discriminator in ColumnVariant arena deserialization.
- **security** — Fixed row policy bypass in the mergeTreeIndex table function and enforced grant checks for ATTACH with URL engine definitions.
- **fixed** — Fixed crashes in Parquet, ORC, and Iceberg readers on malformed input and segfault in showCertificate when TLS certificates are provisioned by ACME.
- **fixed** — Fixed window function issues including wrong results for float PARTITION BY keys with several threads and crashes over Tuple with sparse elements.
- **added** — Added setting text_index_version for better forward compatibility.
- **changed** — Improved Dashboard Webpage and enhanced AI functions to use per-query quotas instead of per-block quotas.