MAL-2026-17763

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@coopeuch/core/MAL-2026-17763.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17763
Published
2026-10-11T14:01:05Z
Modified
2026-10-11T14:30:08Z
Summary
Malicious code in @coopeuch/core (npm)
Details

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

Source: amazon-inspector (35a2aead44a4adb850635cf457613400d143b9e4f047767b111058b881cfbb3f)

On npm install, postinstall.js automatically executes and collects a detailed host and environment report — hostname, username, uid/gid, home directory, platform/arch/release, CPU and memory, DNS servers, non-internal network interfaces (name, address, MAC, CIDR), reverse-DNS internal FQDN, container/orchestrator detection, selected npm_* environment variables including scoped registry configuration, CI markers, current working directory, and the parent consuming project's package.json name, version, and declared dependency range. The JSON report is POSTed to https://collector.oob.s4yhii.com/_npm-poc/beacon and a DNS lookup is issued against a subdomain of oob.s4yhii.com as a secondary out-of-band channel. The package is published publicly as @coopeuch/core at version 1.999.999, a version-number shape designed to win resolution against an internal @coopeuch scope — the canonical dependency-confusion attack shape, confirmed by the beacon specifically reporting the consumer's scoped registry env var and internal manifest coordinates. The installer did not consent to disclosing host identity, internal network topology, or the identity of their private project to a third-party host; a self-described proof-of-concept or coordinated-disclosure framing in the package does not change that the code runs unprompted on install and ships installer-identifying data off-host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-021446",
            "import_time": "2026-10-11T14:18:06.805459793Z",
            "modified_time": "2026-10-11T14:01:05Z",
            "sha256": "35a2aead44a4adb850635cf457613400d143b9e4f047767b111058b881cfbb3f",
            "source": "amazon-inspector",
            "versions": [
                "1.999.999"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @coopeuch/core

Package

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

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": "cd0d3b55a0161d658c6efcdf4bc172c2a5eccf86e67b380a801662f35fa552fb",
            "tlsh": "aae1f86a05fe113222623af4694b50156776d1633504fbf4b9dd8280afcf0ba42bb7ed"
        },
        {
            "path": "package.json",
            "sha256": "123cc2876c995a3bb6ef90611c18d20c258f83d0142930dd58d9c4ac0715ce80",
            "tlsh": "23e06820c5204f2364c96a591c136049a4a2190743083c2433e710ac0b9c33b88bf32d"
        }
    ],
    "package_integrity": [
        {
            "filename": "core-1.999.999.tgz",
            "hashes": {
                "sha1": "a694e1871548449c2454cc9817ee53654e06dd04",
                "sha512_sri": "sha512-MPSsqrm4iVLssounj3qMhYm+NvTT8qeJ8ZeRNEij1cai2IgKTTRm8zNH14TBeygrtPz90t+sb2FMi/CfdGqghQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@coopeuch/core/MAL-2026-17763.json"