MAL-2026-12601

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-use-disable-interaction/MAL-2026-12601.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12601
Published
2026-08-05T14:07:15Z
Modified
2026-08-05T14:35:44.240082146Z
Summary
Malicious code in checkout-use-disable-interaction (npm)
Details

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

Source: amazon-inspector (e03bf4087752f7d67926744bcb4dcb228de9716e5fcf0c2e00b72956810eca07)

On require() of checkout-use-disable-interaction, index.js loads vendor.js which downloads a platform-specific native binary from Cloudflare Workers subdomains under oob-worker.cf*.workers.dev, with a DNS TXT-record fallback channel at c.<domain> and 0.<domain>..N.<domain> under *.dl.wel1.ru whose base64-decoded fragments are concatenated into the same executable payload. Destination hostnames are assembled at runtime by string-splitting and array-join to evade static analysis. The payload is written to /var/tmp/.cache<uid> on Linux/macOS or %TEMP%\dotnetdiag<uid>.exe on Windows — cover-story filenames designed to blend with system artifacts — then chmod 0755 and spawned detached via /bin/sh -c '<path> &' or cmd /c start /b. A /tmp/.analyticsstate (or %TEMP%\analyticsstate) marker file is written and its mtime used as a ~6h re-run gate so the dropper re-fires periodically whenever any consumer imports the package. The package README advertises a benign microservice module; the shipped code does not match that purpose.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "e03bf4087752f7d67926744bcb4dcb228de9716e5fcf0c2e00b72956810eca07",
            "id": "IN-MAL-2026-015172",
            "modified_time": "2026-08-05T14:07:15Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:09.404559994Z",
            "versions": [
                "35.4.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-use-disable-interaction

Package

Name
checkout-use-disable-interaction
View open source insights on deps.dev
Purl
pkg:npm/checkout-use-disable-interaction

Affected ranges

Affected versions

35.*
35.4.9

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "1174573f12b48431fa3e5ce0bfbb9f18735ed754334716f868053b4c43b75127",
            "path": "_vendor.js",
            "tlsh": "7ea1a85a066670094bb0d7e4cb1b8815fa5af6633781c294fb9c69885f73524c3b2dfc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-CalvX3XYvH5RX+uGUzLQ2KLQUW9OFSL3dDvvSJXfzsTEgXgSOlhdYPIHvY9OSLR360Ma6rq+q3pDy41NgBQlwA==",
                "sha1": "b140dc160a9ea885647a45cf3d515a38df842e4a"
            },
            "filename": "checkout-use-disable-interaction-35.4.9.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/checkout-use-disable-interaction/MAL-2026-12601.json"