Which versions of execjs are malicious?

The following PyPI versions of execjs are flagged malicious: 0.0.0.1. Treat any of these as compromised.

How do I remediate execjs if I installed it?

Remove execjs 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 execjs — how do I know if it already compromised me?

If execjs 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 execjs part of a known attack campaign?

Yes — execjs is associated with the RLMA-2025-01960 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 execjs across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for execjs (version 0.0.0.1).

Malicious package

execjsPyPI

execjs is a confirmed malicious PyPI package (MAL-2025-2962) that executes malicious code on install (malicious version 0.0.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in execjs (PyPI)

MAL-2025-2962

Immediate action

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

pip uninstall execjs

Malicious versions

1 flagged

0.0.0.1

Indicators of compromise (SHA-256)

c8faf1b0ccdc758aa8bc1a67dfe532d473a139df61edc4fe51d8057f78b055eb

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for execjs (version 0.0.0.1).
If you installed it — respond
Remove execjs 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 execjs 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. execjs on PyPI has been identified as a malicious package (version 0.0.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2025-01960

Credits

ReversingLabs · finder

Detect & block this

O3 blocks execjs-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