Disclosure summary
piscina is a node.js worker pool implementation. Prior to 4.9.4, 5.3.2, and 6.0.0-rc.5, Piscina stores ThreadPool.options in src/index.ts as a plain object that inherits from Object.prototype. Applications with a separate prototype-pollution primitive can therefore supply inherited values for security-sensitive options that do not have own defaults. An inherited execArgv value is passed to the Node.js Worker constructor and can preload attacker-controlled code in worker threads, an inherited loadBalancer function can execute during task scheduling, and inherited env values can alter worker environments. This issue is fixed in versions 4.9.4, 5.3.2, and 6.0.0-rc.5.
Source-reported weakness categories
CWE-1321
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
GitHub Reviewed Security Advisories · GHSA-67c8-pqhq-4rmx
Open original source · Updated Oct 01, 2026
piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env
Source severity: CRITICAL / 9.2
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| npm | piscina | >= 5.0.0, < 5.3.2 | 5.3.2 |
| npm | piscina | < 4.9.4 | 4.9.4 |
| npm | piscina | >= 6.0.0-rc.1, < 6.0.0-rc.5 | 6.0.0-rc.5 |
NIST National Vulnerability Database · NVD-CVE-2026-102992
Open original source · Updated Sep 30, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
Original records & references
- NIST NVD record
- CVE Program record
- github.com
- github.com
- github.com
- github.com
- github.com
- github.com
- github.com
- github.com
- github.com
PUBLISHED 2026-09-30T16:17:27-04:00
MODIFIED 2026-09-30T17:17:06-04:00
INGESTED 2026-10-06T11:44:59-04:00