Problem/Motivation
Currently, depending on the release of Drupal 12, Drupal 10 may be end of life mid-June, early August or early December in 2026. See #3449806: [12.x] [meta] Release Drupal 12 in 2026 which currently says "Drupal 12 will be released in mid-June, early August, or early December 2026" and https://www.drupal.org/about/core/policies/core-release-cycles/schedule which currently says "Drupal 10 will reach end of life mid-late 2026, when Drupal 12 is released. The exact date is not yet set.".
We have announced this at https://www.drupal.org/blog/drupal-10-will-be-supported-until-the-releas...
The core team would like to get to a stable Drupal 12 by mid-June, but the three windows give an uncertainly to the Drupal 10 EOL timeline. However with a theoretic last Drupal 12 release window in early December 2026, there would nonetheless be a possibility that Drupal 10 would be supported until early December 2026 under the current communicated process.
Steps to reproduce
Proposed resolution
Define early December 2026 as the definite EOL time for Drupal 10.
@catch already consulted the security team and they have agreed to this.
Remaining tasks
When fully agreed, update the release schedule page and add a change record.