MAL-2026-14196

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tfjs-custom-module/MAL-2026-14196.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-14196
Published
2026-08-19T01:17:36Z
Modified
2026-08-19T01:45:11Z
Summary
Malicious code in tfjs-custom-module (npm)
Details

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

Source: amazon-inspector (c50d87a4593cb5a0444f2333f368180b64dfb5d3b8f37e0baf4f6d686ea2ef74)

tfjs-custom-module is a typosquat of the tensorflow/tfjs package. Its package.json declares a postinstall lifecycle script that runs automatically on npm install. The script collects installer host identifiers — os.hostname(), process.platform, process.arch, process.version, package name, and the npm lifecycle event — and POSTs them as JSON via https.request to the hardcoded external host 8xq4kw5d.instances.poc.jchunt.top at path /tfjs-custom-module. The endpoint is not the installer's infrastructure and the beacon is not opt-in. This is host-reconnaissance exfiltration to an author-controlled destination running under a look-alike canary domain, regardless of any self-labeling as security research.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-018278",
            "import_time": "2026-08-19T01:34:41.859795494Z",
            "modified_time": "2026-08-19T01:17:36Z",
            "sha256": "c50d87a4593cb5a0444f2333f368180b64dfb5d3b8f37e0baf4f6d686ea2ef74",
            "source": "amazon-inspector",
            "versions": [
                "1.0.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / tfjs-custom-module

Package

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

Affected ranges

Affected versions

1.*
1.0.0

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "postinstall.js",
            "sha256": "9cba5ad6cbbed6c0f2a870164148e4f38052c8bbf30ce86deaff41445dd50d27",
            "tlsh": "6501fed5d1f9563127f8628068e0af0697fbf223370624f67ac448a92f8d0f900311ac"
        }
    ],
    "package_integrity": [
        {
            "filename": "tfjs-custom-module-1.0.0.tgz",
            "hashes": {
                "sha1": "1ba97085ddfec4912e3813ebba80eb47cadcccf4",
                "sha512_sri": "sha512-+BLJms4CkwN5x2+iq3pZi1vjN+yiT6fC2lcDPSMYNfFi2KfT9W2i+ghxinwxh7QSZeeGklTcQN4KSluD9DreOg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tfjs-custom-module/MAL-2026-14196.json"