MAL-2026-13950

    Dashboard / Malicious Package / MAL-2026-13950

    MAL-2026-13950

    Published: 13 Aug 2026Last Modified: 13 Aug 2026

    Summary: Malicious code in fmt-util-k7x2 (npm)

    Details: Source: amazon-inspector (0e8613ffc5393a31685344c247925a5ef104f7daf3f0d2f45a51918adba7d344) [email protected] advertises itself as a trivial string-formatting utility (index.js exports two-line pad/trim helpers), but its package.json declares a postinstall hook that runs setup.js on every npm install. setup.js probes a list of Twilio-internal hostnames (including code.hq.twilio.com, stage.twilio.com, twilio.jfrog.io, artifacts.twilio.com) and the AWS EC2 instance metadata endpoint at 169.254.169.254, then concatenates the per-target reachability results and sends them as a query string to a hardcoded external host at http://whstool.brkd.no/cb53e6db-e043-4383-89e9-853c9088ee5d?v=<results>. The per-install UUID callback identifies each victim uniquely, and the target set (internal corporate hostnames + cloud metadata service) matches the dependency-confusion reconnaissance pattern. The exfil destination is not owned by Twilio and is unrelated to the package's advertised purpose. The random-suffix name and mismatch between advertised functionality and postinstall behavior are consistent with a targeted dependency-confusion package aimed at Twilio build environments.

    References: https://www.npmjs.com/package/fmt-util-k7x2/v/1.0.1, https://www.npmjs.com/package/fmt-util-k7x2/v/1.0.0

    Affected packages

    Package

    Name: fmt-util-k7x2

    Purl: pkg:npm/fmt-util-k7x2

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    1.0.1
    1.0.0