ClickHouse 26.9 End of Life Date
ClickHouse 26.9 end-of-life date, support status, and CVE risk. Data reconciled from official vendor documentation and endoflife.date at every build; the source of each date is on the product page.
ClickHouse 26.9 was released on September 21, 2026 and has no published end-of-life date yet. It is not an LTS release; ClickHouse reserves longer patch windows for its LTS versions. Its most recent patch is 26.9.2.8, published September 22, 2026.
What does ClickHouse 26.9 end of life mean?
When ClickHouse 26.9 reaches end of life, the maintainers stop issuing security patches for this version. CVEs discovered after the EOL date are publicly disclosed on the National Vulnerability Database with no patch available. Exploit code frequently appears on GitHub within days of disclosure.
The CVE blind spot: A CVE-based scan does not show the ongoing accumulation of unpatched vulnerabilities in EOL software versions. Some scanners flag unsupported versions of common products, but coverage varies, and none of them give you the date in advance. Running ClickHouse 26.9 past its EOL date creates a growing attack surface that a clean scan result does not rule out.
Migrate to ClickHouse 26.9 or implement compensating controls — network segmentation, enhanced monitoring, restricted access — while migration is underway.