NewsPublished 25 May 2026

Over 5,500 GitHub Repositories Infected in ‘Megalodon’ Supply Chain Attack

Source SecurityWeek

Description

Fake automated commits injected GitHub Actions workflows containing payloads to steal credentials, CI secrets, keys, and tokens. The post Over 5,500 GitHub Repositories Infected in ‘Megalodon’ Supply Chain Attack appeared first on SecurityWeek .

Impact

The attack results in the theft of a broad range of sensitive credentials and secrets from infected repositories, including cloud service credentials, SSH keys, API keys, and CI/CD tokens. This exposure can lead to unauthorized access to cloud environments, source code, and other critical infrastructure components. The widespread infection of over 5,500 repositories increases the potential attack surface for downstream users relying on these repositories. However, no known exploits in the wild or direct evidence of further compromise beyond credential theft are reported in the provided data.

Defensive guidance

Organizations should review their GitHub repositories for unauthorized workflow changes, revoke and rotate exposed credentials and tokens, and audit CI/CD pipeline configurations. Monitoring for suspicious GitHub Actions activity and limiting token permissions can help reduce risk. Vendors and maintainers should verify the integrity of source code and workflows before publishing.

References

securityweek.com/over-5500-github-repositories-infected-in-megalodon-supply-chain-attack/ (opens in a new tab)

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Description

AI analysisMachine-generated, updated 25 May 2026, 07:55 UTC

References

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