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ClickHouse 26.3.12.3 LTS Released: What's New in the Latest Patch

ClickHouse 26.3.12.3 LTS Released: What's New in the Latest Patch

ClickHouse pushed out version 26.3.12.3 LTS this week. It's a point release on the long-term support branch. No flashy features here — just the quiet but crucial work of squashing bugs and tightening security. If you're running ClickHouse in production, this is one you'll want to apply.

What Changed

The changelog is short. It includes fixes for a handful of memory leaks under heavy parallel query loads. There's also a patch for a rare race condition in the merge tree engine that could cause data inconsistency. Security-wise, the update addresses a vulnerability in the HTTP interface that allowed unauthorized access to certain system tables. Nothing earth-shattering, but the kind of thing that keeps your data safe.

Beyond that, there are a few performance tweaks. The query optimizer now handles some edge cases in JOIN operations more efficiently. For example, queries with multiple OUTER JOINs on distributed tables should see a 5-10% speed boost on average. Not bad for a patch.

Why It Matters

Stability updates like this one are the backbone of production databases. You don't notice them until they're missing. The memory leak fixes alone could prevent a slow degradation over weeks, saving you from a late-night outage. And that security patch? It's a reminder that even battle-tested software has its weak spots.

ClickHouse is a linchpin for real-time analytics in fintech, AI training pipelines, and enterprise dashboards. A reliable LTS branch means you can build on it with confidence. This release doesn't change the game, but it keeps the game running smoothly.

Official Source: https://github.com/ClickHouse/ClickHouse/releases/tag/v26.3.12.3-lts