registry / Malware / tailwindcss-effect-lab

tailwindcss-effect-lab

A configurable, namespaced Animate.css integration for Tailwind CSS

This report shows the evidence for tailwindcss-effect-lab@1.6.7. 2 of 2 known versions are blocked or flagged. See all versions.

OpenSSF/OSV Malicious Advisory

imported 3d ago · by OpenSSF/OSV

OpenSSF/OSV advisory MAL-2026-18087 confirms this npm version as malicious.

Advisory

MAL-2026-18087

Source

OpenSSF Malicious Packages via OSV

Summary

Malicious code in tailwindcss-effect-lab (npm)

Details

tailwindcss-effect-lab (0.0.0-stage, 1.6.7) is a Tailwind CSS plugin from the fake job interview campaign behind MAL-2026-17665 and MAL-2026-17666: the same Animate.css integration template, README and description, published by johnsmith0821 on 2026-10-09. src/motion.js:5 requires the private scoped package @aaron205whitmore/postcss-animate-utils, which is not readable on the public registry and resolves only with the npm token committed in the lure repository's web/.npmrc, so the code it delivers runs when tailwind.config.js loads the plugin and the dev server starts. The published tarball contains no install scripts and no network code; the payload lives in the private dependency, which was not retrieved. Twenty-six such packages under seventeen accounts were published between 2026-07-28 and 2026-10-09.

References

OpenSSF/OSV advisory ADVISORY ADVISORY ADVISORY WEB

Independent LPM AI assessment

Manual Review

Independent AI assessment: manual_review. LPM AI review remains unresolved.

The unresolved registry dependency is imported and invoked on the plugin's style-generation path, so its behavior cannot be confirmed from inspected source. No independent source evidence establishes malicious behavior; manual review is needed to resolve the dependency.

Static reason

No blocking static signals were detected.

Trigger

Using the plugin to build Tailwind styles.

Impact

The dependency's behavior cannot be assessed from this package snapshot.

Mechanism

Style generation calls the unavailable `@aaron205whitmore/postcss-animate-utils` dependency.

AI rationale

Evidence

package.jsonsrc/motion.jsplugin.jssrc/styles.js

Independent scan evidence

public snapshot

AI called this Manual Review at 78.0% confidence as Unknown with medium false-positive risk.

AI review observations

package.json declares the unresolved dependency `@aaron205whitmore/postcss-animate-utils` at `^1.0.1`.
The plugin reaches `src/motion.js`, which loads and invokes that dependency while building styles; its behavior could not be verified from available source.

Evidence against

The inspected plugin entry builds and registers Tailwind base styles and utilities; no concrete attack behavior was identified in the inspected package source.

Behavioral surface

Source

Filesystem

Supply chainNo supply-chain packaging signals triggered.

ManifestNo manifest risk signals triggered.

scanned 5 file(s), 10.2 KB of source

Source & flagged code

5 flagged

package.jsonView file

Lines 12-49json

12 ],

13 "homepage": "https://sericpieap.github.io/tailwindcss-effect-lab/",

14 "repository": "https://github.com/sericpieap/tailwindcss-effect-lab/",

15 "author": "sericpieap",

16 "license": "MIT",

17 "keywords": [

18 "tailwindcss",

19 "tailwindcss-plugin",

20 "animate.css",

21 "animation",

22 "keyframes",

23 "motion"

24 ],

25 "scripts": {

26 "lint": "eslint . --ext .js",

27 "test": "node --test"

28 },

29 "dependencies": {

30 "animate.css": "^4.1.1",

31 "postcss": "^8.4.5",

32 "@aaron205whitmore/postcss-animate-utils": "^1.0.1",

33 "postcss-js": "^3.0.3",

34 "postcss-selector-parser": "^6.0.8"

35 },

36 "devDependencies": {

37 "eslint": "^8.5.0",

38 "eslint-config-airbnb-base": "15.0.0",

High

Suspicious Dependency Evidence

package.json declares the unresolved dependency `@aaron205whitmore/postcss-animate-utils` at `^1.0.1`.

package.jsonView on unpkg · L32

39 "eslint-plugin-import": "^2.25.2",

40 "tailwindcss": "^3.0.7"

41 },

42 "peerDependencies": {

43 "tailwindcss": "^3"

44 },

45 "engines": {

46 "node": ">=18"

47 }

48}

plugin.jsView file

Lines 1-22javascript

1'use strict';

3const tailwindPlugin = require('tailwindcss/plugin');

4const { loadCatalog } = require('./src/catalog');

5const {

src/motion.jsView file

Lines 1-34javascript

1'use strict';

3const postcss = require('postcss');

4const postcssJs = require('postcss-js');

5const

src/styles.jsView file

Lines 1-25javascript

1'use strict';

3const postcss = require('postcss');

4const postcssJs = require('postcss-js');

5const {

Source & flagged code

5 flagged · loading source

package.jsonView file

32"@aaron205whitmore/postcss-animate-utils": "^1.0.1", "postcss-js": "^3.0.3", "postcss-selector-parser": "^6.0.8" }, "devDependencies": { "eslint": "^8.5.0",

High

Suspicious Dependency Evidence

package.json declares the unresolved dependency `@aaron205whitmore/postcss-animate-utils` at `^1.0.1`.

package.jsonView on unpkg · L32

plugin.jsView file

6const { buildStyles } = require('./src/styles'); function keyframeTailwindPlugin(options = {}) { const config = normalizeOptions(options); return tailwindPlugin(({ addBa

High

Suspicious Dependency Evidence

The plugin reaches `src/motion.js`, which loads and invokes that dependency while building styles; its behavior could not be verified from available source.

plugin.jsView on unpkg · L6

src/motion.jsView file

Findings

5 High2 Low

HighSuspicious Dependency Evidencepackage.json

HighSuspicious Dependency Evidenceplugin.js

HighSuspicious Dependency Evidencesrc/motion.js

HighSuspicious Dependency Evidencesrc/styles.js

LowScripts Present

LowFilesystem

Affected versions and remediation

This report applies to tailwindcss-effect-lab@1.6.7.

The versions list below shows the verdict for each recorded version.

Avoid installing tailwindcss-effect-lab@1.6.7. Remove it from direct dependencies and check your lockfile for transitive copies.
Choose an independently verified alternative or release. This report does not establish that other versions are safe.
If this version ran, investigate the affected machine and build environment. Rotate credentials it could access and rebuild from a trusted environment.

Evidence last updated: 2026-10-20 10:12:06.526Z (UTC).

Source advisory published: 2026-10-19 00:00:00.000Z (UTC).

Think this verdict is wrong? Dispute it on GitHub or read how reports are produced.

Versions

2 known versions

1.6.7latestshownMaliciousMalwareBlockPublishedOct 9, 2026, 3:16 PM 0.0.0-stageMaliciousMalwareBlockPublishedOct 9, 2026, 3:11 PM

OpenSSF/OSV Malicious Advisory

Independent LPM AI assessment

Independent scan evidence

Source & flagged code

Source & flagged code

Findings

Affected versions and remediation

Versions

Related packages

Other malware packages

Behavioral surface

Related packages

Other malware packages

Source & flagged code