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Malicious package

@browserbasehq/mcp-server-browserbasenpm

Advisory published Updated

@browserbasehq/mcp-server-browserbase is a confirmed malicious npm package (MAL-2025-191196) that steals credentials and exfiltrates sensitive data (malicious version 2.4.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @browserbasehq/mcp-server-browserbase (npm)

MAL-2025-191196
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall @browserbasehq/mcp-server-browserbase

What this malware does

The package @browserbasehq/mcp-server-browserbase was found to contain malicious code.

This package was compromised by the Sha1-Hulud: The Second Coming NPM worm. The malicious payload steals tokens and credentials and publishes them to GitHub. The worm will propogate itself to NPM packages the user owns and establish persistence is a GitHub action. The package may also destroy the user's home directory.

Malicious versions

1 flagged
2.4.2

Indicators of compromise (SHA-256)

571a63036ef8332bc8227debf85d750c083b08a0adb2d8274e0e78b3d6688ef6
59c07fb8ebd39670ff0a8c67a71dc45872c40e94a70a4100940576791f12cd66

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for @browserbasehq/mcp-server-browserbase (version 2.4.2).

  2. If you installed it — respond

    @browserbasehq/mcp-server-browserbase 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 @browserbasehq/mcp-server-browserbase 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. @browserbasehq/mcp-server-browserbase on npm has been identified as a malicious package (version 2.4.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks @browserbasehq/mcp-server-browserbase-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

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@browserbasehq/mcp-server-browserbase (npm) malicious package — MAL-2025-191196 | O3 Security