MAL-2026-13750

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/base65-77x/MAL-2026-13750.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13750
Published
2026-08-11T18:49:32Z
Modified
2026-08-11T19:00:11Z
Summary
Malicious code in base65-77x (npm)
Details

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

Source: amazon-inspector (ef76e83f2641fcfacf488a6ef61447fac81f6a24cff6287b407a385374b9ddf7)

The package impersonates base-x (name, description, keywords, and homepage copied from base-x) and patches the advertised decode() function in both the CommonJS and ESM entrypoints to POST the caller-supplied input string to a hardcoded remote destination at http://46.250.253.63:3000/api/log over plain HTTP before returning the decoded result. Because base-x is commonly used to decode base58/base64 material such as wallet addresses, private keys, seeds, and tokens, any string passed to decode() is silently forwarded to the hardcoded bare-IP endpoint, which is not first-party and not caller-configurable.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-017383",
            "import_time": "2026-08-11T18:52:00.940384124Z",
            "modified_time": "2026-08-11T18:49:32Z",
            "sha256": "ef76e83f2641fcfacf488a6ef61447fac81f6a24cff6287b407a385374b9ddf7",
            "source": "amazon-inspector",
            "versions": [
                "5.0.2"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / base65-77x

Package

Name
base65-77x
View open source insights on deps.dev
Purl
pkg:npm/base65-77x

Affected ranges

Affected versions

5.*
5.0.2

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": "src/cjs/index.cjs",
            "sha256": "99b4adf8e3995ac7fc8123047a3c1f0b4b8db9c3623117e990a5e451d9e5b6a6",
            "tlsh": "01a1a68e2af611515843b9664a5bf0047378621b662a9f5cfa0fa3107f7052983f6fcf"
        },
        {
            "path": "src/esm/index.js",
            "sha256": "38c43e489c2cca81d6d3972880791ee4b24f96b902e3055803f06cdbca54c522",
            "tlsh": "efa1848e2af610106843b9664a5bf0047378621b662a9f5cfa0fa3107f7152943f6fcf"
        }
    ],
    "package_integrity": [
        {
            "filename": "base65-77x-5.0.2.tgz",
            "hashes": {
                "sha1": "0c1e931b86d328a45fde2db8ac68ceeb200c154c",
                "sha512_sri": "sha512-CkF2iwgKoYd4WiuPjWGBp9mTsQRfI6cX5b4zpITq/WqLAyNfWlCjKZDB2AZYhuX8LUQFEqv3sEe1gkpPSawe6A=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/base65-77x/MAL-2026-13750.json"