MAL-2026-10096

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/guest-app-ui/MAL-2026-10096.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-10096
Published
2026-07-09T20:43:04Z
Modified
2026-07-09T21:16:56.629315117Z
Summary
Malicious code in guest-app-ui (npm)
Details

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

Source: amazon-inspector (5244faa59fb08eaa6dec10250fe2218a4909cb06ecc6ac972fda38b144f2aaef)

Package publishes as version 99.0.0 under a name presented in its README as an unclaimed internal name, positioning it to win dependency-confusion resolution against private registries. Both preinstall and postinstall lifecycle hooks in package.json execute callback.js, which collects installer host identifiers (os.hostname(), process.env.USER, process.cwd(), __dirname, platform/release, internal IPv4 addresses, and process.env.npmconfigregistry), base64url-encodes the payload, and transmits it over three redundant channels to the hardcoded host 4li9yfz7.instances.httpworkbench.com: a DNS lookup/resolve4 with the payload as a subdomain label, an HTTP POST, and an HTTPS POST with TLS verification disabled (rejectUnauthorized: false). Any organization that has a private package by this name and lacks a scope/registry pin will pull this public artifact on npm install and beacon host fingerprint data to the external interaction host. The self-labeling as an authorized research PoC does not gate the behavior — every installer of this name is fingerprinted unconditionally.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-07-09T21:03:50.942744924Z",
            "modified_time": "2026-07-09T20:43:04Z",
            "versions": [
                "99.0.0"
            ],
            "source": "amazon-inspector",
            "sha256": "5244faa59fb08eaa6dec10250fe2218a4909cb06ecc6ac972fda38b144f2aaef",
            "id": "IN-MAL-2026-009398"
        }
    ]
}
References
Credits

Affected packages

npm / guest-app-ui

Package

Name
guest-app-ui
View open source insights on deps.dev
Purl
pkg:npm/guest-app-ui

Affected ranges

Affected versions

99.*
99.0.0

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/guest-app-ui/MAL-2026-10096.json"
indicators 
{
    "package_integrity": [
        {
            "filename": "guest-app-ui-99.0.0.tgz",
            "hashes": {
                "sha512_sri": "sha512-yYsUyhx3f03KB1iq46qgHf0QustiHbiRXgt2n6Hz3ei5GU+4SSND89CVFeqT5Pj6MTryaN/KVx497sVbqn7EqA==",
                "sha1": "11a9ec1edb52f3dbc736823cf818937eb56b03c1"
            }
        }
    ],
    "evidence_files": [
        {
            "path": "callback.js",
            "sha256": "5861f7d31fe175bddba0e5f4d21339ba2af45bbf65502dd4c02aef5f613602a8",
            "tlsh": "6b61a7ae20b5b42922f335e1454fa425a473f154828ad7c0b41cd2a85f7d1b803b7dfd"
        },
        {
            "path": "package.json",
            "sha256": "ae407ca10f34dd1ae7675a8f06d37672d963df4d56c82a9de1ef4d3d79ab8ef2",
            "tlsh": "4001dc62b70563332cf05bea542d62b62520df265a4b85144a6b2218821f3e603be79b"
        }
    ]
}