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README.md
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@ -23,15 +23,16 @@ StepSecurity Harden-Runner addresses this gap by providing security monitoring t
### Harden-Runner: Security Incidents Detected
- [Harden-Runner Detected the tj-actions/changed-files compromise](https://www.stepsecurity.io/blog/harden-runner-detection-tj-actions-changed-files-action-is-compromised) ([CVE-2025-30066](https://github.com/advisories/GHSA-mrrh-fwg8-r2c3))
- [Harden-Runner Detected a CI/CD Supply Chain Attack in Google’s Open-Source Project Flank](https://www.stepsecurity.io/case-studies/flank)
- [Harden Runner Detected the Sha1-Hulud Supply Chain Attack in CNCF’s Backstage Repository](https://www.stepsecurity.io/blog/how-harden-runner-detected-the-sha1-hulud-supply-chain-attack-in-cncfs-backstage-repository)
- [Harden-Runner Detected the NX Build System compromise](https://www.stepsecurity.io/blog/supply-chain-security-alert-popular-nx-build-system-package-compromised-with-data-stealing-malware)
- [Harden-Runner Detected a CI/CD Supply Chain Attack in Google’s Open-Source Project Flank](https://www.stepsecurity.io/case-studies/flank)
- [Harden-Runner Detected a CI/CD Supply Chain Attack in Microsoft’s Open-Source Project Azure Karpenter Provider in Real-Time](https://www.stepsecurity.io/case-studies/azure-karpenter-provider)
- [Harden-Runner Detected Anomalous Traffic to api.ipify.org Across Multiple Customers](https://www.stepsecurity.io/blog/harden-runner-detects-anomalous-traffic-to-api-ipify-org-across-multiple-customers)
- [Harden-Runner Detected an Unexpected Microsoft Defender Installation on GitHub-Hosted Ubuntu Runners](https://www.stepsecurity.io/blog/how-stepsecurity-harden-runner-detected-unexpected-microsoft-defender-installation-on-github-hosted-ubuntu-runners)
- [Harden-Runner Flagged an Anomalous Outbound Call, Leading to a Docker Documentation Update](https://www.stepsecurity.io/blog/harden-runner-flags-anomalous-outbound-call-leading-to-docker-documentation-update)
### See It in Action
Harden-Runner secures over **8 million CI/CD workflow runs every week**, protecting thousands of pipelines, including those from popular open-source projects by **Microsoft, Google, and CISA**. See how top projects are using Harden-Runner and explore the insights:
Harden-Runner secures over **18 million CI/CD workflow runs every week**, protecting thousands of pipelines, including those from popular open-source projects by **Microsoft, Google, and CISA**. See how top projects are using Harden-Runner and explore the insights:
➡️ [Who's using Harden-Runner?](https://docs.stepsecurity.io/whos-using-harden-runner)
## Quick Links
@ -69,7 +70,7 @@ To integrate Harden-Runner, follow these steps:
```yaml
steps:
- name: Harden Runner
uses: step-security/harden-runner@c6295a65d1254861815972266d5933fd6e532bdf # v2.11.1
uses: step-security/harden-runner@5ef0c079ce82195b2a36a210272d6b661572d83e # v2.14.2
with:
egress-policy: audit
@ -176,7 +177,7 @@ Want to know the technical details? Dive into the architecture of Harden-Runner
## Limitations
While Harden-Runner offers powerful features, there are certain limitations based on the environment, such as OS support. See the complete list in [Known Limitations](docs/limitations.md).
While Harden-Runner offers powerful features, there are certain limitations. See the complete list in [Known Limitations](docs/limitations.md).
---

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docs/how-it-works.md
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For GitHub-hosted runners, Harden-Runner GitHub Action downloads and installs the StepSecurity Agent.
- The code to monitor file, process, and network activity is in the Agent.
- The community tier agent is open-source and can be found [here](https://github.com/step-security/agent). The enterprise tier agent is closed-source. Both agents are written in Go.
- The agent's build is reproducible. You can view the steps to reproduce the build [here](http://app.stepsecurity.io/github/step-security/agent/releases/latest)
- The community tier agent for Linux is open-source and can be found [here](https://github.com/step-security/agent). The enterprise agent for Linux and agents for Windows and macOS are closed-source.
### Self-Hosted Actions Runner Controller (ARC) Runners

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docs/limitations.md
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## Limitations
### GitHub-Hosted Runners
* Only Ubuntu VM is supported. Windows and MacOS GitHub-hosted runners are not supported. There is a discussion about that [here](https://github.com/step-security/harden-runner/discussions/121).
* Harden-Runner is not supported when [job is run in a container](https://docs.github.com/en/actions/using-jobs/running-jobs-in-a-container) with built-in labels such as `ubuntu-latest`, as it needs sudo access on the Ubuntu VM to run. The limitation is if the entire job is run in a container. However, such jobs can be monitored when using custom VM images with GitHub-hosted runners. This is also not a limitation for Self-Hosted runners.
### Self-Hosted Actions Runner Controller (ARC) Runners
* Since ARC Harden Runner uses eBPF, only Linux jobs are supported. Windows and MacOS jobs are not supported.
### Self-Hosted VM (e.g. on EC2) and Bare-metal Runners
* Only Linux jobs are supported. Windows and MacOS jobs are not supported.