Intermittent networking failures across GitHub-hosted Actions runners
This summary is created by Generative AI and may differ from the actual content.
Overview
Intermittent networking failures across GitHub-hosted Actions runners from 08:15 UTC to 17:11 UTC on December 18th, 2025, caused by network packet loss between runners in the West US region and one of GitHub's edge sites, resulting in timeouts during runner setup and workflow execution.
Impact
Approximately 1.5% of jobs on larger and standard hosted runners in the West US region were impacted, 0.28% of all Actions jobs during this period. Self-hosted runners were not impacted.
Trigger
Network packet loss between runners in the West US region and one of GitHub's edge sites
Detection
The incident was detected through reports of degraded performance for Actions and observation of intermittent failures on GitHub-hosted actions runners
Resolution
All traffic was routed away from the affected edge site by 17:11 UTC, mitigating the timeouts. We are observing recovery with request from GitHub-hosted Actions runners and will continue to monitor.
Root Cause
Network packet loss between runners in the West US region and one of GitHub's edge sites