MAL-2026-16379

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@user-services/web-components/MAL-2026-16379.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-16379
Published
2026-09-22T13:57:51Z
Modified
2026-09-22T14:30:06Z
Summary
Malicious code in @user-services/web-components (npm)
Details

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

Source: amazon-inspector (02523ee1cb3bbb9119054ec3ed14ffc62d0d33ae3bd44dc29312c772cdba106b)

@user-services/web-components@9.9.10 fires a hidden telemetry probe on both the npm install lifecycle (node index.js) and on every require() of the module. The probe in probe/impl.js reads os.userInfo().username, os.hostname() and the basename of process.cwd(), concatenates them with a prefix uswc and a timestamp into a subdomain of oob.algamil7x.xyz, and issues a dns.resolve4 query — the query name itself is the exfiltration channel, delivering installer identity to the attacker-controlled authoritative nameserver. The exfil pipeline is deliberately hidden from static analysis: supporting modules (b8d6e3.js, c9e7f4.js) reconstruct the strings os, dns, process, userInfo, hostname, cwd, resolve4 and the destination host oob.algamil7x.xyz from String.fromCharCode byte arrays, and load the os and dns core modules via module.constructor._load(...) instead of a static require. The destination host is not the declared homepage and is not documented anywhere in the package. The scope @user-services and its placeholder repository/author metadata (github.com/user-services/web-components, eng@user-services.dev) are generic and consistent with a dependency-confusion lure aimed at organisations with an internal @user-services/* scope.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020286",
            "import_time":  "2026-09-22T14:19:07.710077681Z",
            "modified_time":  "2026-09-22T13:57:51Z",
            "sha256":  "02523ee1cb3bbb9119054ec3ed14ffc62d0d33ae3bd44dc29312c772cdba106b",
            "source":  "amazon-inspector",
            "versions":  [
                "9.9.10"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @user-services/web-components

Package

Name
@user-services/web-components
View open source insights on deps.dev
Purl
pkg:npm/%40user-services/web-components

Affected ranges

Affected versions

9.*
9.9.10

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":  "runtime/support/telemetry/probe/impl.js",
            "sha256":  "303e024d53affd063c83f1f13df4d0cfd14754e462e96d1ccd4ebc4b0e8ebb00",
            "tlsh":  "78119c5ab253d08f23c04695391c43e1882ec2d087cd10d1bbbc279ba28d7914ad3a66"
        },
        {
            "path":  "runtime/support/telemetry/probe/c9e7f4.js",
            "sha256":  "8abb9d677003e4dbdfe9ed14dc47eca3b9023a66c935989b593ba61d1b58e5cf",
            "tlsh":  "e9e0201b219fe14fa6d85ea73f17c5dac8420900e21d8ad9fa1d4787106a406c0c0770"
        },
        {
            "path":  "package.json",
            "sha256":  "554de13e4624f1bbdd4ef2a958dcbff646058685492ba1f458c2c8f4d4950cce",
            "tlsh":  "ef110821856394331ad03ba09d76284b73a74856cde2bc0c17f7592483ced9a10fe37a"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "web-components-9.9.10.tgz",
            "hashes":  {
                "sha1":  "c3dc537969fc56745a73204da81b3063b562f534",
                "sha512_sri":  "sha512-UOG7X/AW829XHcu1iR2ujidCrJFuSn2H6W5NKsxDc7piQHSUtGdWMU6ErpMecnY3Mb1PLzrL76VlRfi8huDVLQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@user-services/web-components/MAL-2026-16379.json"