MAL-2026-12537

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/cbp-exchange-government-cbp-exchange-government-core/MAL-2026-12537.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12537
Published
2026-08-05T14:16:45Z
Modified
2026-08-05T14:35:06.160343953Z
Summary
Malicious code in cbp-exchange-government-cbp-exchange-government-core (npm)
Details

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

Source: amazon-inspector (4e8845f778d906df5e69c06c91840deb7718a94ccacdd371c987b003f6d85bdb)

index.js unconditionally requires./loader on module load. loader.js assembles three Cloudflare Workers hostnames via split-array .join("") obfuscation (oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev), fetches an opaque platform-specific native binary via https.get, writes it to /var/tmp or %TEMP% under a decoy name (e.g. dotnetdiag<hex>.exe,.cache_<hex>), chmods it 0755, and spawns it detached via cp.spawn("/bin/sh", ["-c", fp + " &"], {detached:true}).unref() (or spawn("cmd",...) on Windows). A secondary DNS-TXT covert channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru reconstructs a base64-encoded payload from numbered TXT records (c.<domain> count + <i>.<domain> chunks) when the HTTPS fetch fails. The binary is unpinned, unhashed, and served from anonymous Workers subdomains — arbitrary attacker-controlled code executes on any host that installs or requires the package. lib/telemetry.js contains parallel dropper primitives (split-string require("child_" + "process"), fs["chmod" + "Sync"], cp.spawn("/bin/sh",...)) staged but not currently reachable from the main entry.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "4e8845f778d906df5e69c06c91840deb7718a94ccacdd371c987b003f6d85bdb",
            "id": "IN-MAL-2026-015237",
            "modified_time": "2026-08-05T14:16:45Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:15.538662226Z",
            "versions": [
                "35.3.3"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / cbp-exchange-government-cbp-exchange-government-core

Package

Name
cbp-exchange-government-cbp-exchange-government-core
View open source insights on deps.dev
Purl
pkg:npm/cbp-exchange-government-cbp-exchange-government-core

Affected ranges

Affected versions

35.*
35.3.3

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "7048b1c3f4b2dfd7a8ac69e1a00effd00735619b396ea9ccc1895587659929e6",
            "path": "_loader.js",
            "tlsh": "f7a1975616a670184bb0a7e4c71b9425f55bf6633b81d2d4fbaca5841f7302483b2efc"
        },
        {
            "sha256": "8eea519a4e746d08577c51947477d28495dde807089c952564659928cd85df11",
            "path": "lib/telemetry.js",
            "tlsh": "13835055566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-ILPZkmAm/B+eI1DMLPIPNShN1JhHktTnsw8/RO33THnweOEfvnx1idqoA/95E+Kj40KSYEjr8K6tsX1kcmFPDQ==",
                "sha1": "e42f8fea808d9871826743998eba68866089aaeb"
            },
            "filename": "cbp-exchange-government-cbp-exchange-government-core-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/cbp-exchange-government-cbp-exchange-government-core/MAL-2026-12537.json"