Malicious code in csvflow-schema (npm)

csvflow-schema is described as a "Lightweight CSV column-schema validation helper" (index.js exports a small validateSchema function) and adds a postinstall script that runs `node ./postinstall.js` on npm install. postinstall.js writes the username, hostname, working directory, parent process id and install path to `csvflow_schema/pi_2c75177b.ok` in the system temp directory, starts `calc.exe` through `cmd /c start`, and sends an HTTPS GET to `https://cdn-status.mulderitsme.net/pi/2c75177b`, a fixed-id install beacon. The npm account f0x_mulder published 1.0.0 on 2026-10-26, a minute after a 0.0.0-stage placeholder, and npm removed the package 17 minutes later.

Source published

26 Oct 2026 18:22:11 UTC

Source modified

28 Oct 2026 06:30:05 UTC

Observed here

28 Oct 2026 07:06:28 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

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