MAL-2026-12221

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tailwind-custom-forms/MAL-2026-12221.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12221
Aliases
  • GHSA-4mgg-vhf5-9r79
Published
2026-08-05T09:05:24Z
Modified
2026-08-31T18:31:24Z
Summary
Malicious code in tailwind-custom-forms (npm)
Details

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

Source: amazon-inspector (0a94fe37df5952bc2326d9f0a759cf89d7105f47790fc71dc4731d87ec67a7f2)

The package impersonates @tailwindcss/forms: package.json declares the name tailwind-custom-forms while the repository field points at github.com/tailwindlabs/tailwindcss-forms and src/index.js contains a verbatim copy of that legitimate plugin. Appended after module.exports = forms; is eval(atob('<large base64 blob>')), which decodes and executes on any require('tailwind-custom-forms'). The decoded payload reconstructs the module names http, https, zlib, url, and child_process from \u escapes to hide its imports, uses child_process.spawn, and builds outbound HTTP requests with keep-alive agents to hosts resolved at runtime from Ethereum JSON-RPC endpoints (eth.blockscout.com/api, 1rpc.io/eth, eth.drpc.org, ethereum-rpc.publicnode.com, eth-mainnet.public.blastapi.io) keyed off the hardcoded ETH address 0xa322E5f3D311D3080e6f0121063e9aDC2490Ef1a, calling paths /0x/cls and /0x/ls. On-chain records act as a rotating dispatcher so the operator can update C2 hosts without republishing the package. Requiring this module executes attacker-controlled code on the installer's machine.

Source: ghsa-malware (3cb82ba15d4c2b620291d5a55882dabedb703d26b992536363a4c3ab72544a7d)

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.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-014540",
            "import_time": "2026-08-05T09:28:23.654684155Z",
            "modified_time": "2026-08-05T09:05:24Z",
            "sha256": "0a94fe37df5952bc2326d9f0a759cf89d7105f47790fc71dc4731d87ec67a7f2",
            "source": "amazon-inspector",
            "versions": [
                "0.5.2"
            ]
        },
        {
            "id": "GHSA-4mgg-vhf5-9r79",
            "import_time": "2026-08-25T15:30:22.774358993Z",
            "modified_time": "2026-08-25T15:00:34Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "3cb82ba15d4c2b620291d5a55882dabedb703d26b992536363a4c3ab72544a7d",
            "source": "ghsa-malware"
        },
        {
            "id": "IN-MAL-2026-019221",
            "import_time": "2026-08-31T18:22:25.303210878Z",
            "modified_time": "2026-08-31T17:50:36Z",
            "sha256": "8267c5dcaaf2fba7458f1349e339b4be87dbaf991ba85b46c96956004718f2fe",
            "source": "amazon-inspector",
            "versions": [
                "0.5.0"
            ]
        },
        {
            "id": "IN-MAL-2026-019215",
            "import_time": "2026-08-31T18:22:24.912420406Z",
            "modified_time": "2026-08-31T17:49:50Z",
            "sha256": "d137f2ab8284db91b86f2338550c81645264ddc425b2f87128afbeaa3dfd7894",
            "source": "amazon-inspector",
            "versions": [
                "0.5.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / tailwind-custom-forms

Package

Name
tailwind-custom-forms
View open source insights on deps.dev
Purl
pkg:npm/tailwind-custom-forms

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.5.0
0.5.1
0.5.2

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"
    },
    {
        "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": "47ce2da0014e4946fe38333dab062eefcdf627eb2d55b681c0cc0920566c1414",
            "tlsh": "6492a5965212372fef17883af9cb9b9c23345071a3ec1b80e057d8756bc9a84755aa0f"
        },
        {
            "path": "package.json",
            "sha256": "94bdbbf2780fffd9e4a319671bb8abcadd9e70ce71449962da7b3b090fdb0235",
            "tlsh": "1521c826cd140e7701e0293596f9118372a7a463895cfc193386c19c8f8d6bfe0fa09f"
        }
    ],
    "package_integrity": [
        {
            "filename": "tailwind-custom-forms-0.5.2.tgz",
            "hashes": {
                "sha1": "a486e81c28189214c1a78595d195ba2caf22cedb",
                "sha512_sri": "sha512-GQ4E6UQIh2iGL1Owhm3LTKz47qFOjOtWoxoD8dlsrbuF/q/5VbDdWgXhxUxfOIyyVQA9pExqMWuikg8Q83YJKg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tailwind-custom-forms/MAL-2026-12221.json"