MAL-2026-5250 Malicious code in executable-stories-cypress (npm)

No concrete installer-harm evidence was identified in this version of executable-stories-cypress. No lifecycle hook payloads, hardcoded exfiltration endpoints, credential-path reads, or known-bad-infrastructure droppers were observed. Coverage of the package contents was partial, so a human reviewer should confirm before the package is treated as fully cleared.

The Miasma malware is a self-propagating worm that spreads across the npm registry by abusing weaponized binding.gyp files to achieve execution during package installation, bypassing security tools that only inspect package lifecycle scripts. Upon execution, the malware attempts to exfiltrate credentials and OIDC tokens for various cloud and registry services, and propagates by compromising other packages managed by the stolen accounts or committing backdoor files to GitHub repositories.