Outage in Pantheon
Drupal 10/11 Site Creation Failing
Resolved MajorIncident Report
Summary AI Generated
Pantheon experienced a major incident where Drupal 10 and 11 site creation was failing due to a security vulnerability in the "symfony/polyfill-intl-idn" library. The issue affected Spinup Operations, preventing users from creating new Drupal sites for 5.6 hours. Pantheon implemented a fix to address the security vulnerability and restored site creation functionality.
Site creation of Drupal 10 and 11 sites are failing due to a security vulnerability recently disclosed in the "symfony/polyfill-intl-idn" library. We are working on a fix to re-enable site creation functionality.
Components affected
Pantheon Spinup OperationsTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
RESOLVED
23 days ago - at 05/27/2026 09:59PM
This incident has been resolved.
MONITORING
23 days ago - at 05/27/2026 08:48PM
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.
IDENTIFIED
23 days ago - at 05/27/2026 06:08PM
The issue has been identified and a fix is being implemented.
INVESTIGATING
23 days ago - at 05/27/2026 04:22PM
Site creation of Drupal 10 and 11 sites are failing due to a security vulnerability recently disclosed in the "symfony/polyfill-intl-idn" library. We are working on a fix to re-enable site creation functionality.
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