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CVE-2026-104848— Tinypool: Prototype Pollution gadget in worker options leads to Remote Code Execution

Quick assessment

Affected
tinylibs tinypool
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Tinypool 是一个精简的 Node.js 工作线程池实现。在 2.1.1 版本之前，Tinypool 从普通的 options 对象中构造 ThreadPool.options，并在 dist/index.js 中读取 execArgv 和 env 工作线程选项。这导致从被污染的 Object.prototype 继承的属性值会被复制到自有属性中，并传递给 worker_threads.Worker。攻击者若能先污染任一相关属性，便可导致每个新启动的工作线程通过命令行 preload 参数或 NODE_OPT

CVSS 9.5 · Critical

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
tinylibs tinypool < 2.1.1 affected
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I. Basic Information for CVE-2026-104848

Vulnerability Information
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Vulnerability Title
Tinypool: Prototype Pollution gadget in worker options leads to Remote Code Execution
Source: CVE Program / CVE List V5
Vulnerability Description
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: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tinylibs tinypool < 2.1.1 -

II. Public POCs for CVE-2026-104848

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III. Intelligence Information for CVE-2026-104848

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Patches & Fixes for CVE-2026-104848 (2)

Vendor Advisories for CVE-2026-104848 (1)

Vendor Pages for CVE-2026-104848 (1)

IV. Related Vulnerabilities

Same product: tinypool
Same vendor: tinylibs
Same weakness: CWE-1321

V. Comments for CVE-2026-104848

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