OpenSSF/OSV advisory MAL-2026-14211 confirms this npm version as malicious. sw-pluginer presents itself as a Tailwind plugin for service worker registration, but its main export — invoked when Tailwind processes its config via require('sw-pluginer') — reads a URL from a staged file at node_modules/.bin/manifest.json, performs an HTTP GET to that URL, and passes the response body directly to eval() in the Node build process...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in sw-pluginer (npm)
Details
sw-pluginer presents itself as a Tailwind plugin for service worker registration, but its main export — invoked when Tailwind processes its config via require('sw-pluginer') — reads a URL from a staged file at node_modules/.bin/manifest.json, performs an HTTP GET to that URL, and passes the response body directly to eval() in the Node build process. The staging file is written by a separate dropper component and is unlinked after being read, hiding the payload destination from static inspection of the sw-pluginer tarball itself. The fetched code is not pinned, hashed, or signature-verified, and it is executed in the developer's Node environment (not in a browser as service worker code) — so whoever controls the staged manifest.json obtains arbitrary code execution on the developer machine at build time. The self-deleting indirection through node_modules/.bin/manifest.json plus eval of unverified network-fetched JavaScript is a covert dropper mechanism, not service worker registration.
Decision reason
OpenSSF Malicious Packages via OSV confirms sw-pluginer@1.0.1 as malicious (MAL-2026-14211): Malicious code in sw-pluginer (npm)