Incident date: July 13, 2026
Impact duration: ~44 minutes
On July 13, 2026, we identified an availability degradation in the platform's authentication flows. The incident was caused by an incompatibility introduced during a rolling deployment of an internal component responsible for validating security tokens. The cause was diagnosed by our operations teams, and rolling back the update restored system stability within minutes.
The degradation lasted approximately 44 minutes and simultaneously affected multiple authentication flows on the platform, resulting in an error rate of approximately 0.9% in customer-facing services. During this period, some end users experienced instability and saw generic error messages (HTTP 500) when attempting to authenticate. Although the event lasted 44 minutes, it fluctuated between increased latency and unavailability.
The failure was caused by a software defect introduced in an update to the security token validation component, resulting in incompatibility between instances running different versions. This incompatibility was not detected in test environments, since it required the simultaneous, parallel execution of different versions. Additionally, the internal endpoint returned an HTTP success response even when validation failed, which prevented automated deployment monitoring systems from detecting the issue and automatically halting the rollout.
Once the cause was identified, the on-call team executed a rollback of the affected component, immediately restoring availability of the authentication flows. The incident was detected by automated SLO alerts within minutes of the degradation starting, and escalation enabled full diagnosis and mitigation of the incident.
We will improve version-compatibility validation in rolling deployments, adjust the HTTP response behavior of internal endpoints to trigger automatic rollback of failing deployments, and standardize error handling to prevent failures from being masked before reaching the customer.
Incidents like this one reinforce our commitment to continuously improving platform reliability. We treat every incident as a learning opportunity, reviewing our processes, strengthening detection and prevention mechanisms, and continuously investing in more robust engineering practices. Our goal is to keep raising the bar on availability and transparency for all of our customers.
Unico Team.