Umbraco

vrelease-17.4.2 scope: release Bugfix

This release fixes issues for SREs watching stability and regressions.

Published 2mo Productivity & Wikis

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✓ No known CVEs patched

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✓ No known CVEs patched in this version

Topics

asp-net-core cms c# dotnet-core umbraco umbraco-cms

ReleasePort's take

Light signal

editorial:auto 2mo

release-17.4.2 reduces cache contention and database load in load-balanced environments by isolating URL table writes, implementing scope-level cache versioning, and automating upgrade coordination.

Why it matters: Load-balanced deployments will reduce database hits during bulk operations through scope-level cache versioning and coordinated table isolation. Test in dev before production upgrade.

Summary

AI summary

Fixed cache lock contention and reduced database hits during bulk operations.

Changes in this release

Type	Severity	Summary	CVE
Bugfix
Bugfix	Medium	Only write URL table to single server in load-balanced environments. Only write URL table to single server in load-balanced environments. Source: llm_adapter@2026-05-21 Confidence: high	—
Bugfix	Medium	Add scope-level cache version tier to reduce database hits. Add scope-level cache version tier to reduce database hits. Source: llm_adapter@2026-05-21 Confidence: high	—
Bugfix	Medium	Add automatic upgrade coordination for load-balanced setups. Add automatic upgrade coordination for load-balanced setups. Source: llm_adapter@2026-05-21 Confidence: high	—

Full changelog

What's Changed

🐛 Bug Fixes

Cache: Only write to url table on a single server in load balanced environments to remove lock contention by @nikolajlauridsen in
https://github.com/umbraco/Umbraco-CMS/pull/22890
Cache: Add scope-level cache version tier to reduce DB hits in bulk operation by @nikolajlauridsen in https://github.com/umbraco/Umbraco-CMS/pull/22563
Migrations: Add auto upgrade coordination for load-balanced setups by @nikolajlauridsen in https://github.com/umbraco/Umbraco-CMS/pull/22815

Full Changelog: https://github.com/umbraco/Umbraco-CMS/compare/release-17.4.1...release-17.4.2

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