Which versions of circuit-playground are malicious?

The following npm versions of circuit-playground are flagged malicious: 66.55.16, 66.55.17, 999.55.17. Treat any of these as compromised.

How do I remediate circuit-playground if I installed it?

Remove circuit-playground from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

I already installed circuit-playground — how do I know if it already compromised me?

If circuit-playground 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.

Is circuit-playground part of a known attack campaign?

Yes — circuit-playground is associated with the RLMA-2026-01206 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find circuit-playground across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for circuit-playground (3 malicious versions).

Malicious package

circuit-playgroundnpm

Advisory published Mar 18, 2026Updated Mar 23, 2026

circuit-playground is a confirmed malicious npm package (MAL-2026-1692) that executes malicious code on install (malicious versions 66.55.16, 66.55.17, 999.55.17). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in circuit-playground (npm)

MAL-2026-1692

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall circuit-playground

What this malware does

The package circuit-playground was found to contain malicious code.

Malicious versions

3 flagged

66.55.1666.55.17999.55.17

Indicators of compromise (SHA-256)

806d600dcb20c118ed53e03e43c9cd3af7bf96ba4d74dbcac9039e18eea23d48

df14ec9e065e3076946203915696c2efd4a96a737eac1605e10665c2276d7ca7

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for circuit-playground (3 malicious versions).
If you installed it — respond
Remove circuit-playground from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If circuit-playground 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. circuit-playground on npm has been identified as a malicious package (versions 66.55.16, 66.55.17, 999.55.17 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-01206

Credits

Amazon Inspector · finder
ReversingLabs · finder

Detect & block this

O3 blocks circuit-playground-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database