insomnia-plugin-poc-m4gester-run (npm) · Malicious Code
Affects insomnia-plugin-poc-m4gester-runSource GCVE Database
Malicious package : remove insomnia-plugin-poc-m4gester-run and rotate any secrets on hosts that installed it.
Data as of 14 Jul 2026, 09:52 UTC
Malicious package
Published to npm · OSV MAL-2026-10493
What to do
Remove insomnia-plugin-poc-m4gester-run from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| npminsomnia-plugin-poc-m4gester-run | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
Description
The npm package insomnia-plugin-poc-m4gester-run version 1.0.0 contains malicious code that executes arbitrary commands on Windows machines during installation. Specifically, its postinstall lifecycle hook runs calc.exe, demonstrating the capability for remote code execution at install time. The package does not provide any legitimate Insomnia plugin functionality and appears to be a proof-of-concept for exploitation. This behavior poses a risk to developers who install this package on Windows systems.