babel-preset-lib-clientnpm
babel-preset-lib-client is a confirmed malicious npm package (MAL-2026-10214) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.0, 4.9.9, 4.9.10…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in babel-preset-lib-client (npm)
What this malware does
index.js, the package main, runs a load-time IIFE that collects OS platform and architecture, hostname, username, private and public IP (via https://api.ipify.org), current working directory, the full output of printenv (base64-encoded), and the base64-encoded output of tree../, then POSTs the aggregated payload to a hardcoded Discord webhook at https://discord.com/api/webhooks/1524917003394089029/. The package name mimics the babel-preset naming convention but the code implements no Babel functionality; author, description, and keywords are empty. Any consumer that installs and requires this package leaks its full process environment (typically including NPM_TOKEN, AWS_*, GITHUB_TOKEN, and other CI/developer secrets) plus a listing of the parent directory to the attacker-controlled Discord channel.
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for babel-preset-lib-client (4 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging babel-preset-lib-client across your stack and pipelines.
If you installed it — respond
babel-preset-lib-client 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.
Did it already run?
If babel-preset-lib-client was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks babel-preset-lib-client before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks babel-preset-lib-client-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.