MAL-2026-17764

    Dashboard / Malicious Package / MAL-2026-17764

    MAL-2026-17764

    Published: 11 Oct 2026Last Modified: 11 Oct 2026

    Summary: Malicious code in @s4yhiitestpoc/r2-https (npm)

    Details: Source: amazon-inspector (b6042f718b39be380eeda7c31dc46b056e753cb8a39e51897c8106e49b44f4d0) On npm install, the package's declared postinstall script (postinstall.js) collects installer host fingerprint data — hostname, username, home directory, platform/arch/OS release, current working directory, install directory, DNS server list, non-internal network interface addresses, Node.js version, and npm_* environment values including npm_config_registry — and POSTs the collected JSON to https://collector.oob.s4yhii.com/_npm-poc/beacon. It additionally performs an out-of-band DNS lookup against a subdomain of oob.s4yhii.com (db03o8lag74hsugsg2j091t8mfcf437h3.oob.s4yhii.com) to confirm execution via DNS exfiltration. The destination is a hardcoded author-controlled domain, the behavior fires automatically at install time without consent, and the exfiltrated data includes npm_config_registry which can disclose an internal/private registry URL. A self-described 'PoC' or 'coordinated disclosure' framing does not change the fact that installer-identifying data and internal registry configuration leave the host to a third-party endpoint.

    References: https://www.npmjs.com/package/@s4yhiitestpoc/r2-https/v/1.0.0

    Affected packages

    Package

    Name: @s4yhiitestpoc/r2-https

    Purl: pkg:npm/%40s4yhiitestpoc/r2-https

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    1.0.0