Which versions of eslint-plus are malicious?

The following npm versions of eslint-plus are flagged malicious: 6.0.4, 6.0.5. Treat any of these as compromised.

How do I remediate eslint-plus if I installed it?

eslint-plus is a typosquat — you almost certainly intended a legitimately-named package. Remove eslint-plus, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.

I already installed eslint-plus — how do I know if it already compromised me?

If eslint-plus 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 eslint-plus part of a known attack campaign?

Yes — eslint-plus is associated with the IN-MAL-2026-009324, IN-MAL-2026-009325 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 eslint-plus across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for eslint-plus (2 malicious versions).

Malicious package

eslint-plusnpm

Advisory published Jul 9, 2026Updated Jul 9, 2026

eslint-plus is a confirmed malicious npm package (MAL-2026-10087) that typosquats a legitimate package to trick installs (malicious versions 6.0.4, 6.0.5). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in eslint-plus (npm)

MAL-2026-10087

Immediate action

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

npm uninstall eslint-plus

What this malware does

Package declares postinstall: node lib/utils/index.js, which spawns a detached, stdio-suppressed Node child (spawn with detached:true, stdio:'ignore', child.unref()) that runs lib/utils/smtp-connection/index.js. That script uses axios to GET https://jsonkeeper.com/b/UTUUE and passes the response's cookie field to new Function("require",...)(require), executing whatever JavaScript the anonymous mutable paste currently returns with full Node privileges on the installer's machine. jsonkeeper.com is a public, anonymously-editable JSON paste service, so the executed code can be silently swapped by the operator at any time. The detach + stdio-ignore + unref pattern is designed to survive after npm install exits and to hide output from the installer. Separately, the package is named eslint-plus and its homepage/description reference React Training and eslint tooling, but main points at lib/nodemailer.js and the tarball ships a copied nodemailer source tree authored by 'Andris Reinman' — a namespace/impersonation cover for the dropper.

Malicious versions

2 flagged

6.0.46.0.5

Indicators of compromise (SHA-256)

6360adb10a187657f54fabe4bfa066299ac0bfde2e8d932ede94dd5ef702764e

fbc3baf80e31e8027d7bb5b3fe5a873c5ff72d8344d39f8f01e191699a2310d7

Detection & response playbook

Typosquat

Find it
Search your lockfiles and build artifacts for eslint-plus (2 malicious versions).
If you installed it — respond
eslint-plus is a typosquat — you almost certainly intended a legitimately-named package. Remove eslint-plus, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.
Did it already run?
If eslint-plus 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. eslint-plus on npm has been identified as a malicious package (versions 6.0.4, 6.0.5 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-009324IN-MAL-2026-009325

References

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks eslint-plus-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