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Malicious package

insomnia-plugin-api-lint-helpernpm

Advisory published Updated

insomnia-plugin-api-lint-helper is a confirmed malicious npm package (MAL-2026-17561) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in insomnia-plugin-api-lint-helper (npm)

MAL-2026-17561
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall insomnia-plugin-api-lint-helper

What this malware does

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.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

f3572e41f2e2e83a3156c1b24bf8684c0149a508e45626e80c592657cfb475ba

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for insomnia-plugin-api-lint-helper (version 1.0.0).

  2. If you installed it — respond

    insomnia-plugin-api-lint-helper is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If insomnia-plugin-api-lint-helper was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. insomnia-plugin-api-lint-helper on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-021012

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks insomnia-plugin-api-lint-helper-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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insomnia-plugin-api-lint-helper (npm) malicious package — MAL-2026-17561 | O3 Security