Security
Are GitHub Actions runners secure?
Quick answer
GitHub-hosted and reputable managed runners are ephemeral single-use VMs, which is the right isolation model.
The detail that matters
The risk is usually in your workflow — over-permissioned tokens, unpinned third-party actions, and pull_request_target misuse.
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Related
Are snapshot runners safe for public repositories?Only if snapshots are taken from trusted branches and never from fork pull requests.How do I generate an SBOM?Enable buildx's sbom: true output, or run syft against the built image.How do I attach build provenance?Use actions/attest-build-provenance, or buildx's provenance: true attestation.How do I pass secrets into a Docker build?Use BuildKit build secrets with --secret, never ARG or ENV.