Which versions of immer-js are malicious?

Every published version of immer-js on npm is considered malicious. Remove the package entirely.

How do I remediate immer-js if I installed it?

Remove immer-js 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 immer-js — how do I know if it already compromised me?

If immer-js 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.

Is immer-js part of a known attack campaign?

Yes — immer-js is associated with the GHSA-p865-gwfh-48x2 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 immer-js across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for immer-js (all published versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging immer-js across your stack and pipelines.

Malicious package

immer-jsnpm

Malicious code in immer-js (npm) Remove it immediately and rotate any exposed credentials.

MAL-2026-223

Immediate action

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

npm uninstall immer-js

What this malware does

The package immer-js was found to contain malicious code.

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

all versions

Every published version of this package is considered malicious — remove it entirely.

Indicators of compromise (SHA-256)

920c7d161c9e90ea35c168d53dd01e0920704e5f35e76d330fac6fb3c0a2cb87

8bc0710eb5a0ad9d9eb01cbd2d6f7c1b9cc39b07636d82a05f2cafdf953756bd

Detection & response playbook

Malicious package

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for immer-js (all published versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging immer-js across your stack and pipelines.
If you installed it — respond
Remove immer-js 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 immer-js 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 immer-js 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

No. immer-js on npm has been identified as a malicious package (all published versions flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GHSA-p865-gwfh-48x2

References

github.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks immer-js-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