MalwarePublished 14 Jul 2026

elsisi-cli (npm) · Malicious Code

Affects elsisi-cliSource GCVE Database

Malicious package : remove elsisi-cli and rotate any secrets on hosts that installed it.

Data as of 14 Jul 2026, 09:30 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-10551

What to do

Remove elsisi-cli 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
npmelsisi-cli	Affected =9.9.9	Fixed in–

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Description

The npm package elsisi-cli version 9.9.9 contains malicious lifecycle scripts that execute during installation. These scripts send outbound HTTP requests to an attacker-controlled webhook, leaking the installer's current working directory and hostname. The package tarball includes only a package.json file with no legitimate source code or functionality, indicating its sole purpose is data exfiltration during installation.

Impact

Installation of elsisi-cli version 9.9.9 results in unintended outbound network requests to an attacker-controlled server, leaking potentially sensitive environment information such as the current working directory and hostname. This data exposure could aid attackers in reconnaissance or further targeted attacks. No additional malicious payload or code execution beyond this data exfiltration is indicated.

Defensive guidance

Avoid installing elsisi-cli version 9.9.9. Monitor for and block outbound requests to the specified webhook.site URL if possible. Exercise caution when installing packages from untrusted sources and audit lifecycle scripts in npm packages.

Summary

The elsisi-cli npm package at version 9.9.9 declares preinstall and postinstall scripts in its package.json that invoke wget commands targeting a webhook.site URL. These scripts automatically execute on npm install, sending the installer's current working directory and hostname as query parameters to an attacker-controlled endpoint. The package tarball contains only the package.json file (371 bytes) and lacks the declared main entry file index.js or any other source files, confirming that the package's only effect is to beacon environment information to the attacker.

References

npmjs.com/package/elsisi-cli/v/9.9.9 (opens in a new tab)

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What to do

Affected software

Description

AI analysisMachine-generated, updated 14 Jul 2026, 09:30 UTC

Technical details

References

Community reviews