tinylibs Tinypool up to 2.1.0 Worker Options dist/index.js prototype pollution

Summaryinfo

A vulnerability was found in tinylibs Tinypool up to 2.1.0 and classified as critical. This issue affects some unknown processing of the file dist/index.js of the component Worker Options. Such manipulation leads to prototype pollution. This vulnerability is documented as CVE-2026-104848. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in tinylibs Tinypool up to 2.1.0 and classified as critical. Affected by this issue is an unknown code of the file dist/index.js of the component Worker Options. The manipulation with an unknown input leads to a prototype pollution vulnerability. Using CWE to declare the problem leads to CWE-1321. The product receives input from an upstream component that specifies attributes that are to be initialized or updated in an object, but it does not properly control modifications of attributes of the object prototype. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-104848 since 10/02/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059 by the MITRE ATT&CK project.

Upgrading to version 2.1.1 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• tinylibs

Name

• Tinypool

Version

• 2.0
• 2.1.0

Website

• Product: https://github.com/tinylibs/tinypool/

CPE 2.3info

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CPE 2.2info

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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