Outage in Klaviyo

Data processing delays

Resolved Minor
December 18, 2025 - Started 4 days ago - Lasted about 2 hours
Official incident page

Incident Report

Starting around 9:52pm US Eastern, a database upgrade failure caused data processing delays in-app. As a result, we are experiencing delays in event processing, flows, unsubscribes, segmentation, sending for certain campaigns, and v3 APIs. No data loss is expected. We are actively working to resolve the incident and will provide updates when possible.
Components affected
Klaviyo API Klaviyo Segmentation Klaviyo Flow Triggering Klaviyo App Klaviyo Campaign Email Sending Klaviyo Flow Email Sending

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Latest Updates ( sorted recent to last )
RESOLVED 4 days ago - at 12/18/2025 06:36AM

This incident has been resolved.

MONITORING 4 days ago - at 12/18/2025 06:06AM

A fix has been implemented and we are monitoring the results.

IDENTIFIED 4 days ago - at 12/18/2025 05:12AM

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

INVESTIGATING 4 days ago - at 12/18/2025 04:10AM

Starting around 9:52pm US Eastern, a database upgrade failure caused data processing delays in-app. As a result, we are experiencing delays in event processing, flows, unsubscribes, segmentation, sending for certain campaigns, and v3 APIs. No data loss is expected. We are actively working to resolve the incident and will provide updates when possible.

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