MAL-2026-12607

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-auth-api-adapters/MAL-2026-12607.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12607
Published
2026-08-05T14:07:22Z
Modified
2026-08-05T14:35:46.651977781Z
Summary
Malicious code in claims-auth-api-adapters (npm)
Details

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

Source: amazon-inspector (a214cb0da52b5d7bb026d974fbcd6897b455b8ca000e3ef92c6205678742935e)

index.js unconditionally requires./runtime on module load. runtime.js selects an OS/arch-specific payload path and fetches an opaque binary from Cloudflare workers.dev hosts whose names are assembled from split string fragments (e.g. oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS TXT fallback that base64-reassembles the payload from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched binary is written to /tmp with a hidden dot-prefixed name on Unix (.cache<tag>) or to %TEMP% as dotnetdiag<tag>.exe on Windows, chmod 0755'd, and spawned detached via /bin/sh -c or cmd.exe. Comments and env-var checks (DONOTTRACK, ANALYTICSOPTOUT) and the dotnetdiag/analytics_state filenames present the behavior as telemetry while the split-literal host assembly defeats plain-string scanning. Any process that require()s this package, directly or transitively, causes attacker-controlled code to run on the host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "a214cb0da52b5d7bb026d974fbcd6897b455b8ca000e3ef92c6205678742935e",
            "id": "IN-MAL-2026-015173",
            "modified_time": "2026-08-05T14:07:22Z",
            "import_time": "2026-08-05T14:20:09.493828538Z",
            "source": "amazon-inspector",
            "versions": [
                "35.3.3"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-auth-api-adapters

Package

Name
claims-auth-api-adapters
View open source insights on deps.dev
Purl
pkg:npm/claims-auth-api-adapters

Affected ranges

Affected versions

35.*
35.3.3

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "6bc5de8ed1f12b3da2a4110bdab5e977d6b63241c73140c24c1b0d676f305cf0",
            "path": "_runtime.js",
            "tlsh": "0bb1a65616aa70184bb1e7f4c7174415f65af6633380c294fb9ca9981f72124c3b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-wz7poLfpPDs4VA3UxQCF1KiKF++kl2WY2YXZmh2tQA61FEBvV+NAVptBHDiEF6+uAp/XZEMRftQEabJcn7EmOA==",
                "sha1": "1fbd40a0285e9146bff5f80988f68833750c2ae8"
            },
            "filename": "claims-auth-api-adapters-35.3.3.tgz"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-auth-api-adapters/MAL-2026-12607.json"