MAL-2026-17301

    Dashboard / Malicious Package / MAL-2026-17301

    MAL-2026-17301

    Published: 29 Sept 2026Last Modified: 29 Sept 2026

    Summary: Malicious code in fs-commons (npm)

    Details: 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.

    References: https://www.npmjs.com/package/fs-commons/v/1.0.1

    Affected packages

    Package

    Name: fs-commons

    Purl: pkg:npm/fs-commons

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    1.0.1