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There will be a Drupal core security release for all supported branches on May 20, 2026, between 17:00 and 21:00 UTC. (To see this in your local timezone, refer to the Drupal Core Calendar.) The Drupal Security Team urges you to reserve time for core updates at that time because exploits might be developed within hours or days.

Not all configurations are affected. Reserve time on May 20 during the release window to determine whether your sites are affected and in need of an immediate update. Mitigation information will be included in the advisory.

We recommend updating to the latest supported patch (bugfix) release for your site's version of Drupal before May 20, so that you can address any other upgrade issues before the security window. 

References:
https://www.drupal.org/psa-2026-05-18

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