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MAL-2026-18357unknownNo CVE assignedReported malicious package

Malicious code in csvflow-schema (npm)

Impact

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…

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

csvflow-schema npm

Read the explicit versions or original source for affected-version evidence.

Version evidence: OSV · MAL-2026-18357

View original version evidence (1 explicit versions)

Original source description

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.

References