MAL-2026-16201 Malicious code in webpackbootstrap5 (npm)

Malicious package Published
Package
webpackbootstrap5
Registry
npm

What is MAL-2026-16201?

MAL-2026-16201 is a malicious package in webpackbootstrap5, published on 14 Sep 2026.

Official description

[email protected] typosquats bootstrap and ships a disguised in-browser proxy kit. Its bundled loader (index-z2b7r4.js) XOR-decodes a list of endpoints with a fixed key and injects remote scripts from https://dyingefforlessefforlessours.com via document.head.appendChild, then boots a Scramjet/wisp WebSocket proxy that routes page traffic through operator-controlled relays. The loader matches (same sha256) sibling packages webpackbootstrapscripts and @zaka13/thing by the same publisher (zaka13). Harm is browser-side when the asset is served; no install script runs.

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.

What should I do about MAL-2026-16201?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

Sources

Also known as GHSA-2q27-vrr7-584g.

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