Disclosure summary
Tinypool is a minimal Node.js worker thread pool implementation. Prior to 2.1.1, Tinypool constructs ThreadPool.options from a normal options object and reads the execArgv and env worker options in dist/index.js, allowing values inherited from a polluted Object.prototype to be copied into own properties and passed to worker_threads.Worker. An attacker who can first pollute either property can cause each newly spawned worker to load attacker-selected JavaScript through command-line preload arguments or NODE_OPTIONS, resulting in code execution with the host process's privileges and possible access to CI secrets, signing material, or build artifacts. This issue is fixed in version 2.1.1.
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-5gmw-xhrv-c9v3
Open original source · Updated Oct 05, 2026
Tinypool: Prototype Pollution gadget in worker options leads to Remote Code Execution
Source severity: CRITICAL / 9.5
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| npm | tinypool | 2.1.1 |
NIST National Vulnerability Database · NVD-CVE-2026-104848
Open original source · Updated Oct 02, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
Original records & references
PUBLISHED 2026-10-02T13:17:03-04:00
MODIFIED 2026-10-02T14:33:20-04:00
INGESTED 2026-10-06T11:45:30-04:00