A systemic class of exploitable CI/CD vulnerabilities in the open source software supply chain exposes millions of repositories to takeover, cybersecurity firm Novee warns.

Referred to as Cordyceps, the security defects allow unauthenticated attackers to hijack developer workflows and gain full control over affected repositories.

Agentic coding, Novee says, has resulted in insecure patterns being reproduced across millions of repositories through automatically generated CI/CD workflows.

The flaws, ranging from command injection to authentication logic, artifact poisoning, and privilege escalation, impact build tooling from Microsoft, Google, Apache, Cloudflare, and the Python Software Foundation, with a ripple effect reaching thousands of other organizations.

Any unauthenticated attacker with a free account can exploit these weaknesses to forge approvals, push code, and exfiltrate credentials, without an organization membership or special privileges.