5,561 GitHub Repositories Hit by Megalodon Supply Chain Attack in Six Hours

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May 22, 2026 at 1:51 PM

Actively Exploited

Overview

Researchers at SafeDep have identified a significant cybersecurity incident known as the Megalodon attack, which has compromised 5,561 GitHub repositories within a short span of six hours. The attack specifically targets continuous integration (CI) workflows, enabling attackers to steal cloud credentials. This incident raises serious concerns for developers and organizations using GitHub, as the theft of cloud credentials could lead to unauthorized access to sensitive resources and data. It's essential for users to be vigilant about the security of their repositories and ensure that their CI workflows are secure. The rapid spread of this attack emphasizes the need for robust security measures in software development environments.

Key Takeaways

Active Exploitation: This vulnerability is being actively exploited by attackers. Immediate action is recommended.
Affected Systems: 5,561 GitHub repositories
Action Required: Users should review and secure CI workflows, and rotate any compromised cloud credentials immediately.
Timeline: Newly disclosed

Original Article Summary

SafeDep uncovered the Megalodon attack targeting 5,561 GitHub repositories with malicious CI workflows and cloud credential theft.

Impact

5,561 GitHub repositories

Exploitation Status

This vulnerability is confirmed to be actively exploited by attackers in real-world attacks. Organizations should prioritize patching or implementing workarounds immediately.

Timeline

Newly disclosed

Remediation

Users should review and secure CI workflows, and rotate any compromised cloud credentials immediately.

Additional Information

This threat intelligence is aggregated from trusted cybersecurity sources. For the most up-to-date information, technical details, and official vendor guidance, please refer to the original article linked below.

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