MAL-2026-17301

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/fs-commons/MAL-2026-17301.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17301
Published
2026-09-29T23:24:17Z
Modified
2026-09-29T23:45:38Z
Summary
Malicious code in fs-commons (npm)
Details

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

Source: amazon-inspector (f7e82e98343807c39ea786017de4d2a7455815424155ca2a856333d895c8a48b)

The package presents itself as a filesystem/data-helper library, but its exported getTransactions()/load_transaction_data() functions are a two-file dynamic-code loader. index.js hides the identifiers 'Function', 'require', 'process', 'Buffer', and 'setTimeout' behind a split-string array and obtains the Function constructor indirectly via globalThis.constructor.constructor, defeating static review. At call time it reads the sibling file models.js, which is disguised as an array of product-record objects but whose mark fields are base64 ciphertext. loadConfig()/processData() sort the records by id, concatenate every mark, apply a per-count Caesar shift, base64-decode the result, and pass the resulting source to the Function constructor with Buffer, require, and process injected, then invoke it. Any consumer that requires fs-commons and calls getTransactions() executes attacker-supplied code with full Node privileges on the host process. The obfuscation, the indirect Function-constructor acquisition, and the disguising of the payload as product metadata in a sibling file have no legitimate purpose for a data-helper library and are the fingerprint of a supply-chain remote-code-execution package.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-020698",
            "import_time":  "2026-09-29T23:39:24.55566493Z",
            "modified_time":  "2026-09-29T23:24:17Z",
            "sha256":  "f7e82e98343807c39ea786017de4d2a7455815424155ca2a856333d895c8a48b",
            "source":  "amazon-inspector",
            "versions":  [
                "1.0.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / fs-commons

Package

Name
fs-commons
View open source insights on deps.dev
Purl
pkg:npm/fs-commons

Affected ranges

Affected versions

1.*
1.0.1

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":  "index.js",
            "sha256":  "53a5d6dfb922ca08b58e7c5f5975d885009c0b5a89c0c6805d14832962c21fae",
            "tlsh":  "a6f10f6839f930248457b07c67eb9449612de0576e9a6ca87f4d83101f7d13ce1f6ba8"
        },
        {
            "path":  "models.js",
            "sha256":  "65b54532c82855bbc8055c67d9f53854737ce01d3ae6b95fc6577204b81d953f",
            "tlsh":  "4e331f3acb780c5b91795a606af50a4af280471f17a16d877fbcd54c8fb1c5b804ab3b"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "fs-commons-1.0.1.tgz",
            "hashes":  {
                "sha1":  "e50c4a623a29ce361d41d3c91e60ca49bbe9429a",
                "sha512_sri":  "sha512-hGqVRB9UCGkZy94B9xU1HFy9BUqXGuSbLyRPQZb9GJYINs48j2o/qE3NOHG7g6eMlgpPTcgDc8fA69dWgFDHKQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/fs-commons/MAL-2026-17301.json"