GitHub outage: Authentication issues related to API requests

1. resolvedJun 10, 2026, 16:39 UTC

   Between 15:05 UTC and 16:25 UTC, GitHub API services experienced degraded availability due to sporadic authentication failures affecting approximately 9% of requests. Customers experienced intermittent "logged out" behavior as erroneous 401 responses triggered repeated authentication flows in app integrations. Affected requests also experienced approximately 800ms of additional latency. A memcached proxy service rollout to our internal API infrastructure caused our authentication service to pick up an incorrect memcached host configuration, leading to intermittent authentication lookup failures. We mitigated the incident by deploying a configuration change to memcached to use the correct host. To prevent similar issues in the future, we plan to migrate our authentication system to the new memcached infrastructure to improve resilience and strengthen overall reliability posture.

What APIStatus.watch saw

Our 5-minute checks didn't record a change in GitHub's overall status around this incident. Smaller or regional incidents often leave a provider's overall status green.

Other services with incidents at the same time

Overlapping incidents aren't necessarily related.

• Grafana Cloud: Brief Rule Evaluation Failures in prod-eu-west-3Major · Jun 7, 2026, 01:39 UTC
• Grafana Cloud: Grafana Dashboards page not displaying when set to ‘View by Folders’Major · Jun 10, 2026, 10:49 UTC
• Mux: Elevated errors in Mux Data dashboard and APIMajor · Jun 10, 2026, 14:04 UTC
• OVHcloud: [EU-WEST-PAR][Public Cloud] - Network connectivity issues notificationMajor · Jun 10, 2026, 15:20 UTC
• Twilio: SMS Delivery Delays from a Subset of Twilio Alphanumeric Sender IDs to Vodacom TanzaniaMinor · Jun 2, 2026, 19:28 UTC
• Twilio: SMS Delivery Delays from a Subset of Twilio Short Codes and Long Codes to United Wireless and Panhandle Telecommunications Systems United StatesMinor · Jun 4, 2026, 16:51 UTC
• Akamai: Edge Delivery - HTTP Content Delivery in EuropeMinor · Jun 5, 2026, 16:36 UTC
• Twilio: SMS Delivery Delays from Twilio to MPT MyanmarMinor · Jun 9, 2026, 08:54 UTC
• LaunchDarkly: Delays in event ingestionMinor · Jun 9, 2026, 12:08 UTC
• Twilio: SMS Delivery Delays and Failures from Twilio to Babilon-M TajikistanMinor · Jun 10, 2026, 06:19 UTC

How often does GitHub have incidents?

GitHub reported 66 incidents in the last 90 days, 26 of them major or critical. A typical incident lasted 1h 21m. See GitHub's uptime and incident history