TL;DR

  • Extended Content Security Policy (CSP) telemetry.
  • Fixed an issue with the description editor appearing empty.
  • Improved Queue.maintain performance through caching.

Key Changes

Jenkins 2.566, released on 2026-05-26, focuses on security data collection, UI stability, and core performance.

  • New Features: Telemetry for Content Security Policy (CSP) has been extended (#26807). This provides more data for monitoring and enhancing security configurations.
  • Bug Fixes: The description editor no longer appears empty upon initial load (#26795), improving user experience when configuring jobs or views.
  • Maintenance: Performance of Queue.maintain has been optimized by introducing a cache for Util.isOverridden (#26797). This contributes to a more responsive Jenkins environment, especially under heavy load.

For the official changelog, visit https://www.jenkins.io/changelog/2.566/.

Impact for QA Teams

QA teams benefit from a more stable Jenkins UI and improved performance, which can streamline CI/CD pipeline execution. Enhanced CSP telemetry provides better insights for security testing and compliance, ensuring a more secure automation environment. For optimizing test automation, consider integrating these updates into your Jenkins pipeline for test automation.