GitHub outage, 20 September 2026
Incident with Pull Requests
- Started
- Resolved
- 20 Sept 2026, 23:22 UTC (after 1 h 8 min)
- Impact
- Minor
- Affected
- Pull Requests
Last update from GitHub
On September 20, 2026, between 21:46 and 22:24 UTC the Pull Requests service was degraded and pull request merge and test-merge commits were created late, with delays reaching approximately four minutes at peak. Merge commits were delayed rather than lost. Because some Actions workflow runs start only after a pull request's merge commit is created, a subset of workflow runs for pull request events were also delayed. <br /><br />This was due to a routine repository maintenance job for an unusually large repository consuming nearly all of the memory on a single Git storage server, which left that server unable to serve the Git operations used to create merge commits. <br /><br />We mitigated t...
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