CVE-2026-104848: Tinylibs Tinypool

Critical severity, CVSS 9.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Tinylibs Tinypool: before 2.1.1 (fixed in 2.1.1)

Published 2026-10-02. Last modified 2026-10-02.