MAL-2026-13248

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-rx-post-message/MAL-2026-13248.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13248
Published
2026-08-05T15:33:54Z
Modified
2026-08-05T16:50:12.086426680Z
Summary
Malicious code in bigops-rx-post-message (npm)
Details

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

Source: amazon-inspector (1298706de8e41561be6743e6d8349c5feefb81bec1ba71f3f2da3995d845ac98)

On require() of bigops-rx-post-message, index.js executes init.js at module top level, which downloads a platform-specific binary from Cloudflare Workers hosts whose names are assembled at runtime from string-split arrays (e.g. oob-worker.cf10x-*.workers.dev) with a DNS-TXT base64 fallback across sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched bytes are written under /var/tmp or %TEMP% with a disguised name (.cache<hex> / dotnetdiag<hex>.exe), chmodded 0755, and spawn-detached via /bin/sh -c or cmd.exe. No hash or signature verification is performed, the destinations are not the publisher's infrastructure, and lib/telemetry.js contains the same dropper primitives with child_process obtained via string concatenation (require("child_"+"process")) and fs["chmod"+"Sync"] indexed by string to evade static scanners. Installing or requiring this package causes an unpinned, attacker-controlled executable to run on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T15:33:54Z",
            "source": "amazon-inspector",
            "sha256": "1298706de8e41561be6743e6d8349c5feefb81bec1ba71f3f2da3995d845ac98",
            "import_time": "2026-08-05T16:13:39.744159159Z",
            "id": "IN-MAL-2026-015747",
            "versions": [
                "35.1.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bigops-rx-post-message

Package

Name
bigops-rx-post-message
View open source insights on deps.dev
Purl
pkg:npm/bigops-rx-post-message

Affected ranges

Affected versions

35.*
35.1.5

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "bigops-rx-post-message-35.1.5.tgz",
            "hashes": {
                "sha512_sri": "sha512-nfToO+N5uTG+p/QrNOwoOqFAtSaKQx8cpb1P9AGCsYgCbP8zKpJyho/FEXOTcTYBhQOeZKnOnbwgJ70RGpxMLQ==",
                "sha1": "0f1bf92c48021ecfa7114dd98a1f906431f7989c"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "a9a1a85a15a970184bb0a7e0c7174419f65bf653378086d5f75c55981fb21248372efc",
            "sha256": "b9ada96ecd1b232a0ab10ccb69cd3c523addb3ed4940b812724c09314624a7cd",
            "path": "_init.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-rx-post-message/MAL-2026-13248.json"
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]