@secauditb20y/sec-test-r3b

Details

**Severity:** Critical

**Affected versions:** `= 1.0.0`

## Source: amazon-inspector (df7034b94531c8be5e9141c7a5cf73f552486c1b307672346a0e646e60207b7c)
package.json declares a postinstall script that runs `node -e` to invoke fs.writeFileSync, creating /tmp/PWN_R3REAL/FIRED on the installer's machine when the package is installed. The package's main module only exports the literal value 42 and ships no native build or legitimate reason for install-time execution; the postinstall exists solely to demonstrate arbitrary code execution on the installer host at `npm install` time. The behavior fires automatically on default install and writes to a path outside the package directory, matching the shape of a proof-of-execution beacon. The package name and description self-identify as an authorized security test, but self-labeling is not a mitigation and the code path is functionally identical to a dropper marker.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/d9cd431fa896929a9e6e248e0deeb69e782e4250/osv/malicious/npm/@secauditb20y/sec-test-r3b/MAL-2026-13989.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/d9cd431fa896929a9e6e248e0deeb69e782e4250/osv/malicious/npm/@secauditb20y/sec-test-r3b/MAL-2026-13989.json
- https://www.npmjs.com/package/@secauditb20y/sec-test-r3b/v/1.0.0
- https://github.com/advisories/GHSA-whmg-4w65-37cm

Compromised versions (1)

• = 1.0.0

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.