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OpenAdvisories
Malicious MAL-2026-17561

insomnia-plugin-api-lint-helper

npm package · versions 1.0.0

Reported Oct 5, 2026 · Updated Oct 5, 2026

If this package is installed

Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.

Details

Source: amazon-inspector (f3572e41f2e2e83a3156c1b24bf8684c0149a508e45626e80c592657cfb475ba)
index.js, the package's main entry, runs at require() time with no user interaction. On load it spawns OS-native calculator processes via child_process.exec ('calc.exe' on Windows, 'open -a Calculator' on macOS, 'gnome-calculator' on Linux) to demonstrate arbitrary code execution; writes a marker file to the user's Desktop (INSOMNIA_RCE_PROOF.txt); and serializes the full process.env object with JSON.stringify and emits it to the console, disclosing any tokens, API keys, and other secrets present in the environment of the host process (typically Insomnia on a developer machine). The source comments self-identify the module as a proof-of-concept remote code execution payload targeting Insomnia's plugin loader. The arbitrary-exec, filesystem write outside the package directory, and bulk environment enumeration all fire unconditionally at load.