MAL-2026-16303

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@nimbusedge2/authxsas/MAL-2026-16303.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-16303
Published
2026-09-21T03:07:04Z
Modified
2026-09-21T03:30:16Z
Summary
Malicious code in @nimbusedge2/authxsas (npm)
Details

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

Source: amazon-inspector (0146259024cc8ef3a174ff98571fe4af975b3eecf9184a0a5339d42808243d10)

The package's package.json declares a preinstall script that fires unconditionally on npm install. The script uses curl to query the cloud instance metadata service via the nip.io wildcard-DNS resolver (169.254.169.254.nip.io/latest/meta-data/), base64-encodes the response, and POSTs it over plain HTTP to a hardcoded canarytokens.com endpoint (http://canarytokens.com/terms/7dc94zmd3so67n5vbz5bxmt7v/contact.php). On installers running on AWS/GCP/Azure hosts with IMDS reachable, this leaks IAM role identifiers and, on IMDSv1, temporary cloud credentials to a third-party canary endpoint at install time. The tarball ships no source files; the manifest and its preinstall hook are the entire payload. The scope name and package name are consistent with a dependency-confusion / SSRF canary probe targeting an internal namespace.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020202",
            "import_time":  "2026-09-21T03:24:20.9568188Z",
            "modified_time":  "2026-09-21T03:07:04Z",
            "sha256":  "0146259024cc8ef3a174ff98571fe4af975b3eecf9184a0a5339d42808243d10",
            "source":  "amazon-inspector",
            "versions":  [
                "1.1.0"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @nimbusedge2/authxsas

Package

Name
@nimbusedge2/authxsas
View open source insights on deps.dev
Purl
pkg:npm/%40nimbusedge2/authxsas

Affected ranges

Affected versions

1.*
1.1.0

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":  "package.json",
            "sha256":  "4ec4a0153134528a3599d806665bb975f1793628746e4604d77a790f7364674c",
            "tlsh":  "45e0c02815107c772dcdc7e0b675032976b07b1f4e80ae1c9093091c1e2d9de3a23f44"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "authxsas-1.1.0.tgz",
            "hashes":  {
                "sha1":  "0193d18e3e795cf71d83895f9d9100d243420c72",
                "sha512_sri":  "sha512-6BlFoBJp8Tyk6nHgUY/U3Vf8Z/NCs422QP7XprUIXx9m9ScPzZSxazx/nQcW8Qpl3/IrLC+Sn40Pqzg3t7Nsxg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@nimbusedge2/authxsas/MAL-2026-16303.json"