Disruption with some GitHub services
Incident
Report for GitHub
Resolved
On October 21, 2025, between 13:30 and 17:30 UTC, GitHub Enterprise Cloud Organization SAML Single Sign-On experienced degraded performance. Customers may have been unable to successfully authenticate into their GitHub Organizations during this period. Organization SAML recorded a maximum of 0.4% of SSO requests failing during this timeframe.
This incident stemmed from a failure in a read replica database partition responsible for storing license usage information for GitHub Enterprise Cloud Organizations. This partition failure resulted in users from affected organizations, whose license usage information was stored on this partition, being unable to access SSO during the aforementioned window. A successful SSO requires an available license for the user who is accessing a GitHub Enterprise Cloud Organization backed by SSO.
The failing partition was subsequently taken out of service, thereby mitigating the issue.
Remedial actions are currently underway to ensure that a read replica failure does not compromise the overall service availability.
This incident stemmed from a failure in a read replica database partition responsible for storing license usage information for GitHub Enterprise Cloud Organizations. This partition failure resulted in users from affected organizations, whose license usage information was stored on this partition, being unable to access SSO during the aforementioned window. A successful SSO requires an available license for the user who is accessing a GitHub Enterprise Cloud Organization backed by SSO.
The failing partition was subsequently taken out of service, thereby mitigating the issue.
Remedial actions are currently underway to ensure that a read replica failure does not compromise the overall service availability.
Update
Mitigation continues, the impact is limited to Enterprise Cloud customers who have configured SAML at the organization level.
Update
We continuing to work on mitigation of this issue.
Update
We’ve identified the issue affecting some users with SAML/OIDC authentication and are actively working on mitigation. Some users may not be able to authenticate during this time.
Update
We're seeing issues for a small amount of customers with SAML/OIDC authentication for GitHub.com users. We are investigating.
Investigating
We are currently investigating this issue.
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