MAL-2026-17759

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@coopeuch/button/MAL-2026-17759.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17759
Published
2026-10-11T13:51:41Z
Modified
2026-10-11T14:30:06Z
Summary
Malicious code in @coopeuch/button (npm)
Details

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

Source: amazon-inspector (ee1a3bb0818d46a9c83659ed32f8ab209477970658d5f6f8241a12c96d137c98)

The package's postinstall lifecycle script (postinstall.js) runs automatically on npm install and harvests installer host identifiers — hostname, username, uid/gid, home directory, non-internal network interfaces with MAC addresses and CIDRs, configured DNS servers, reverse-DNS internal FQDN, CPU/memory, the consumer package name/version/path, CI markers, npm_config_* values, and container runtime indicators — then POSTs the JSON report over HTTPS to the hardcoded host collector.oob.s4yhii.com at /_npm-poc/beacon and issues a DNS lookup for a label-prefixed subdomain of oob.s4yhii.com as an out-of-band beacon. The destination is not the installer's own infrastructure and is not caller-configurable. The @coopeuch scope combined with the 1.999.999 version has the shape of dependency-confusion targeting of a specific organization's internal namespace, in which npm install resolves this public package in place of an intended internal one and emits the fingerprint to the author's collector.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-021386",
            "import_time": "2026-10-11T14:18:01.403405383Z",
            "modified_time": "2026-10-11T13:51:41Z",
            "sha256": "ee1a3bb0818d46a9c83659ed32f8ab209477970658d5f6f8241a12c96d137c98",
            "source": "amazon-inspector",
            "versions": [
                "1.999.999"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @coopeuch/button

Package

Name
@coopeuch/button
View open source insights on deps.dev
Purl
pkg:npm/%40coopeuch/button

Affected ranges

Affected versions

1.*
1.999.999

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": "c859191e9d7e04d59b5d2f566799feb31594a68573350bd17661be469e8663ef",
            "tlsh": "0ae1fa6a05fe1132226235f4694b50156776d1633504fbf4b9dd8280afcf0ba42bb7ed"
        }
    ],
    "package_integrity": [
        {
            "filename": "button-1.999.999.tgz",
            "hashes": {
                "sha1": "61f39ae0da10a23d16e2de630ae0d5ce74568d47",
                "sha512_sri": "sha512-SCbYYuiCW0bOdd4UWw/wU3O5OQlXaFmEYuQTFJjW1n1JEATG2c8uoSp7nnBbrNteRPcxjtIJlrAlGR2O90WjAA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@coopeuch/button/MAL-2026-17759.json"