GitHub outage blocks Actions runs and Pages during authentication incident

GitHub experienced an Actions and Pages outage on May 26, 2026, after authentication issues stopped many workflow runs from starting and prevented actions from being downloaded. The disruption affected software teams that rely on GitHub for CI/CD pipelines, automated testing, deployments, and static site publishing.

The official GitHub status incident report says the company began investigating degraded performance for Actions and Pages at 10:57 UTC. By 11:53 UTC, GitHub said authentication issues were causing failures in starting Actions runs and downloading actions, with the majority of Actions runs affected.

GitHub identified the cause of the authentication issues at 12:37 UTC, mitigated the degradation by 13:00 UTC, and marked the incident resolved at 13:18 UTC. The company said a detailed root cause analysis would be shared later.

What happened during the GitHub outage

The disruption centered on GitHub Actions, but GitHub Pages also experienced degraded performance. For developers, this meant pipelines could fail before running jobs, deployments could stall, and projects using Pages builds could face publishing delays.

GitHub Actions documentation describes Actions as a way to automate software development workflows inside a repository, including CI/CD tasks. When authentication failures stop runs from starting or actions from downloading, the impact can spread across build, test, scan, and deployment workflows.

The incident also affected some GitHub records beyond Actions and Pages. GitHub said a small number of Issues, PRs, Comments, and Discussions were marked as hidden during the incident, though no data was lost.

Time	GitHub update
10:57 UTC	GitHub began investigating degraded performance for Actions and Pages
11:19 UTC	Actions was listed as experiencing degraded availability
11:53 UTC	GitHub confirmed authentication issues affecting Actions runs and action downloads
12:37 UTC	GitHub said it had identified the cause and was working on mitigation
13:00 UTC	The degradation affecting Actions and Pages was mitigated
13:18 UTC	The incident was marked resolved

Why authentication failures hit CI/CD pipelines

GitHub Actions depends on authenticated requests at several points in a workflow. A job may need to pull repository content, download an action, access a runner, use a token, or trigger deployment-related steps.

When authentication breaks, the workflow may fail before any project code is tested. This can block pull request checks, release jobs, container builds, security scans, and production deployment gates.

The GitHub continuous integration guide explains that CI workflows can build code and run tests on GitHub-hosted or self-hosted runners. During this outage, the problem was not necessarily the project code or runner configuration. The failure came from platform authentication issues affecting Actions itself.

• New workflow runs could fail to start.
• Actions could fail to download during job setup.
• Pull request checks could remain blocked or incomplete.
• Deployments tied to successful workflow runs could be delayed.
• Security scans running through Actions could miss scheduled windows.
• GitHub Pages deployments connected to repository workflows could be affected.

GitHub Pages was also affected

GitHub Pages hosts static websites from GitHub repositories. Many developers use it for project documentation, landing pages, open-source docs, personal sites, and lightweight deployment workflows.

The GitHub Pages documentation describes Pages as a static site hosting service that can take HTML, CSS, and JavaScript files from a repository, optionally run them through a build process, and publish a website.

Because Pages can rely on repository builds and deployment workflows, an Actions and authentication disruption can affect site publishing even if the website content itself has not changed.

Affected service	Likely user impact
GitHub Actions	Workflow runs failed to start or could not download actions
GitHub Pages	Static site publishing and build-related activity could be delayed
Pull request checks	Required CI checks could remain pending or fail
Release pipelines	Automated deployments could pause until Actions recovered
Issues, PRs, Comments, and Discussions	A small number of records were temporarily marked as hidden

Why the outage mattered for software teams

For teams that use GitHub Actions as their main CI/CD platform, an authentication outage can stop delivery even when code, tests, and deployment targets remain healthy. The platform becomes the bottleneck.

This matters most for organizations that require Actions checks before merging pull requests or shipping releases. If a required workflow cannot start, developers may be unable to merge, deploy, or verify changes through normal controls.

The GitHub incident page shows the disruption lasted a little over two hours from the first investigation update to final resolution. For global teams, that was enough to interrupt release windows and automated maintenance tasks.

What developers should do after recovery

Now that GitHub has resolved the incident, teams should review failed workflow runs before manually re-running jobs. Some failures may reflect the platform outage rather than actual code or configuration problems.

Developers should also check Pages deployments if their sites rely on Actions or build steps. A green status after recovery does not always mean every missed deployment or failed run automatically retried.

The GitHub Actions documentation can help teams confirm how their workflows handle retries, dependencies, artifacts, and deployment jobs after a service disruption.

1. Check workflow runs that failed between 10:57 UTC and 13:18 UTC.
2. Confirm whether failures mention authentication, action downloads, or run startup.
3. Re-run failed workflows only after confirming GitHub status is operational.
4. Review deployment jobs that depend on Actions success.
5. Check GitHub Pages sites for missed or delayed publishing.
6. Document any release delays caused by the outage.

How teams can reduce CI/CD outage risk

No hosted development platform can guarantee that every service will remain available at all times. Teams that depend on GitHub Actions for production releases should plan for what happens when the CI/CD layer is temporarily unavailable.

The GitHub Actions CI guidance shows how workflows build and test code, but organizations still need operational plans for delayed runs, skipped release windows, and emergency fixes during platform incidents.

Practical resilience does not always require moving away from GitHub. It can mean keeping manual deployment procedures documented, separating emergency hotfix paths from normal release automation, and knowing which checks can wait during an outage.

Risk	Practical preparation
Required checks cannot run	Define who can approve an emergency exception and when
Release pipeline stalls	Keep a documented manual rollback and release process
Security scans miss a schedule	Re-run scheduled scans after service recovery
Pages deployment is delayed	Verify published content after the incident resolves
Developers retry too early	Wait for the official status page to show mitigation or resolution

GitHub Pages users should verify publishing

Teams using Pages for documentation or project websites should confirm that builds and deployments completed after the outage. A failed or delayed Pages update can leave old documentation online longer than expected.

The GitHub Pages documentation notes that Pages publishes static files from a repository and may use a build process. If that build process was tied to the outage window, maintainers should check the latest deployment status.

This matters for release notes, developer docs, compliance pages, and public-facing project sites. A delayed static site update may not break an application, but it can still confuse users if documentation falls behind the code release.

Bottom line

GitHub’s May 26 outage disrupted Actions and Pages because authentication issues prevented many Actions runs from starting and blocked action downloads. GitHub mitigated the issue by 13:00 UTC and resolved it at 13:18 UTC.

The incident did not involve data loss, according to GitHub, but it did temporarily affect software delivery workflows for teams that depend on Actions and Pages. GitHub said a detailed root cause analysis will follow.

For engineering leaders, the lesson is clear: CI/CD reliability needs a backup plan. Teams should know how to handle failed workflow runs, missed deployments, blocked checks, and delayed Pages publishing during hosted platform incidents.

FAQ