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
Aliases
  • GHSA-5h58-475h-6287
Published
2026-10-11T13:58:48Z
Modified
2026-10-12T19:30:04Z
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.

Source: ghsa-malware (7bb4ede3c2c6108558588512db3e190f0255516a40707bd801219d684b0aaff9)

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-2026-021433",
            "import_time": "2026-10-11T14:18:05.240602486Z",
            "modified_time": "2026-10-11T13:58:48Z",
            "sha256": "887c41c0805d7d223c499e702796cf46727b0be152b7c8a65607907afb3b5d59",
            "source": "amazon-inspector",
            "versions": [
                "1.999.999"
            ]
        },
        {
            "id": "GHSA-5h58-475h-6287",
            "import_time": "2026-10-12T19:24:46.899886577Z",
            "modified_time": "2026-10-12T19:07:14Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "7bb4ede3c2c6108558588512db3e190f0255516a40707bd801219d684b0aaff9",
            "source": "ghsa-malware"
        }
    ]
}
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

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

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"
    },
    {
        "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"