MAL-2026-17760

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@coopeuch/common/MAL-2026-17760.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17760
Published
2026-10-11T13:58:48Z
Modified
2026-10-11T14:30:08Z
Summary
Malicious code in @coopeuch/common (npm)
Details

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

Source: amazon-inspector (887c41c0805d7d223c499e702796cf46727b0be152b7c8a65607907afb3b5d59)

@coopeuch/common@1.999.999 publishes to the public npm registry under a scope the publisher does not own, using an inflated version (1.999.999) consistent with the dependency-confusion technique that outranks internal-registry versions. The package's declared postinstall script (postinstall.js) runs automatically on npm install and collects installer-side host and network data — hostname, username, uid/gid, home directory, non-internal network interface addresses with MAC/CIDR, DNS resolver addresses, reverse-DNS internal FQDN, container markers, CI environment-variable presence, npm_config_registry, and the consuming project's package name/version/declared range — then POSTs it as JSON to the hardcoded author-controlled endpoint https://collector.oob.s4yhii.com/_npm-poc/beacon. A secondary DNS beacon is emitted via dns.lookup to a subdomain of oob.s4yhii.com. Any build that resolves @coopeuch/common from the public registry (including internal builds referencing the @coopeuch scope) will auto-exfiltrate internal hostnames, MAC addresses, usernames, internal registry URLs, and project identity to a third-party collector at install time. The package's README self-labels this as a coordinated-disclosure proof of concept; the harvesting and off-host upload nonetheless occur without installer opt-in.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-021433",
            "import_time": "2026-10-11T14:18:05.240602486Z",
            "modified_time": "2026-10-11T13:58:48Z",
            "sha256": "887c41c0805d7d223c499e702796cf46727b0be152b7c8a65607907afb3b5d59",
            "source": "amazon-inspector",
            "versions": [
                "1.999.999"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @coopeuch/common

Package

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

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"
        },
        {
            "path": "package.json",
            "sha256": "0460202496c4e21d871ff51598019aeb1d27b5083ebf22611dc5456a64d0dbaa",
            "tlsh": "1ee02230c5314f33a4d829a90d37264660aa296387083c2863eb426c4bdc77b88ff32d"
        }
    ],
    "package_integrity": [
        {
            "filename": "common-1.999.999.tgz",
            "hashes": {
                "sha1": "f1278ee12b8adc385a28b5847ebbaef5f4e41be7",
                "sha512_sri": "sha512-aVYGJ0N6KMZH6QKeZwlw88VVV1+9Nh1lLGmbI/R7fCWJvnLnoiBRe7op2ptvfDIokoyiyPKyCuvJmvfs33mT0Q=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@coopeuch/common/MAL-2026-17760.json"