Drupal 10/11 Site Creation Failing

Event timeline

How this incident unfolded, from the official status page.

1. Investigating

   5 months ago

   Pantheon

   Site creation of Drupal 10 and 11 sites are failing due to a <a href="https://symfony.com/blog/cve-2026-46644-insecure-equivalence-in-symfony-polyfill-intl-idn-for-ascii-only-xn-labels">security vulnerability</a> recently disclosed in the "symfony/polyfill-intl-idn" library. We are working on a fix to re-enable site creation functionality.

2. Identified

   5 months ago

   Pantheon

   The issue has been identified and a fix is being implemented.

3. Monitoring

   5 months ago

   Pantheon

   A fix has been implemented and site creation should be working again. Please contact Support if you continue to have issues with new site creation.

4. Resolved

   5 months ago

   Pantheon

   This incident has been resolved.