Security experts reported a serious software supply chain attack on June 1, 2026, after discovering that more than 30 trusted @redhat-cloud-services npm packages had been tampered with. Unlike traditional typosquatting attacks that rely on deceptive package names, this incident involved the takeover of a trusted and widely used package ecosystem. The operation, named "Miasma: The Spreading Blight," has been linked to a new evolution of the Mini Shai-Hulud malware family, previously associated with the TeamPCP threat group.Investigations revealed that attackers likely gained access through compromised CI/CD infrastructure by abusing GitHub Actions OpenID Connect (OIDC) authentication mechanisms. Malicious versions of affected packages contained a preinstall script that automatically executed during npm installation, allowing the malware to run before any application code was launched. The payload used several layers of obfuscation and decryption techniques to avoid detection before deploying a temporary Bun-based execution component. Once activated, the malware aggressively searched for sensitive information across developer systems, cloud environments, and CI runners. Targeted assets included GitHub authentication tokens, cloud provider credentials, Kubernetes configurations, Vault secrets, SSH keys, Docker credentials, npm and PyPI publishing tokens, and environment configuration files. In environments with sufficient permissions, it also attempted to retrieve secrets directly from cloud secret management services.To avoid raising suspicion, the malware disguised outbound communications as requests to a domain path resembling a legitimate AI service endpoint. Stolen information was reportedly stored in publicly accessible repositories created under compromised GitHub accounts. The malware also established persistence through system services and modified development tools and project configurations to ensure continued execution. Organizations impacted by this campaign should immediately isolate affected systems, remove persistence mechanisms, rotate compromised credentials, rebuild trusted environments, and verify package integrity before restoring normal operations. The incident highlights the growing risks associated with software supply chain attacks and the importance of securing automated development pipelines.
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