MAL-2026-16262

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tailwindcss-form-ui/MAL-2026-16262.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-16262
Published
2026-09-17T19:51:15Z
Modified
2026-11-11T21:15:15Z
Summary
Malicious code in tailwindcss-form-ui (npm)
Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (ba05c76200656d6746f6f200e1e45f8027d4c87bb6b2312b9690aad262ddf39c)

tailwindcss-form-ui@0.5.8 impersonates @tailwindcss/forms: package.json sets author to '@tailwindcss' and repository to https://github.com/tailwindlabs/tailwindcss-forms while publishing under an unrelated name, and the README and plugin source are verbatim copies of the real @tailwindcss/forms with a malicious preamble added. The declared main entry src/index.js prepends ~15 KB of obfuscated code to the copied plugin. A custom deterministic string-shuffle primitive (functions named spin/peel/splitLane with hardcoded seed arrays) reconstructs the identifiers 'constructor', 'require', 'module', and 'global' at runtime, then invokes the Function constructor on a decoded code blob and immediately calls the resulting function with require bound as a local parameter: Forge('z', peel(''))(require). This executes attacker-controlled code with full Node module access the moment any consumer require()s the package. A Tailwind CSS plugin has no legitimate need to construct and run dynamically-decoded code at import time or to pass require into it; the obfuscation primitive exists only to hide the stager from static review.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-020139",
            "import_time": "2026-09-17T20:18:44.980237849Z",
            "modified_time": "2026-09-17T19:51:15Z",
            "sha256": "c7a21e4623006a0c69e3dfeb80857eadd9102550c8a77c1d95e880245a5f0fa9",
            "source": "amazon-inspector",
            "versions": [
                "0.5.1"
            ]
        },
        {
            "id": "IN-MAL-2026-022602",
            "import_time": "2026-11-11T21:05:23.139955637Z",
            "modified_time": "2026-11-11T20:55:16Z",
            "sha256": "ba05c76200656d6746f6f200e1e45f8027d4c87bb6b2312b9690aad262ddf39c",
            "source": "amazon-inspector",
            "versions": [
                "0.5.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / tailwindcss-form-ui

Package

Name
tailwindcss-form-ui
View open source insights on deps.dev
Purl
pkg:npm/tailwindcss-form-ui

Affected ranges

Affected versions

0.*
0.5.1
0.5.8

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "src/index.js",
            "sha256": "f5fd0ca9d7642087d0edf609c126197b4d958cc2e1d576c62d444287444e229d",
            "tlsh": "9503e9957e81121a33434f7fba1bf4e4e12a1899369448c7d21cbc94f8e631ae9f6d34"
        },
        {
            "path": "package.json",
            "sha256": "3d69860a60dfe83778e5d2fdf8e93d8cf796283d9832663ffe00ade9c8a6c79c",
            "tlsh": "a421c822cd140e7301e0293596f905837297a463895cf81a3396c19ccf8d6bfe0f909f"
        }
    ],
    "package_integrity": [
        {
            "filename": "tailwindcss-form-ui-0.5.1.tgz",
            "hashes": {
                "sha1": "6ad4e9d33db7ff1f025da8ee3be606323f0f48ca",
                "sha512_sri": "sha512-pukhSsK+8SK6vgskhwNxkr5IlhRnIEtpu84CISV2zwKNY8gQ01l8NMMDCIdoKlUMFh16b+l9O23Fe0r/6H3wiQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tailwindcss-form-ui/MAL-2026-16262.json"