Outage in Heroku
Heroku Service Degradation
Resolved MinorIncident Report
Summary AI Generated
## Heroku Service Degradation Summary A security update for Heroku Common Runtime applications in the EU region unintentionally enforced stricter TLS certificate policies, causing TLS handshake failures that prevented clients from connecting to apps on the default `herokuapp.com` domain. The issue affected Apps components and persisted for approximately 1.2 hours before engineers identified the root cause and began remediation.
A recent security update for Common Runtime applications in the EU region may have unintentionally enforced a stricter policy for TLS certificates used for app default domain TLS termination (.herokuapp.com). This caused some clients to experience TLS handshake failures and to be unable to connect to apps. Engineers have identified the issue and we are working on remediating.
Components affected
Heroku AppsTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
UPDATE
about 1 hour ago - at 08/25/2026 03:40PM
A recent security update for Common Runtime applications in the EU region may have unintentionally enforced a stricter policy for TLS certificates used for app default domain TLS termination (.herokuapp.com). This caused some clients to experience TLS handshake failures and to be unable to connect to apps. Engineers have identified the issue and we are working on remediating.
INVESTIGATING
about 2 hours ago - at 08/25/2026 03:03PM
Heroku engineers are investigating.
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