tinylibs Tinypool up to 2.1.1 pool.run options information disclosure

Summaryinfo

A vulnerability was found in tinylibs Tinypool up to 2.1.1. It has been classified as problematic. Impacted is the function pool.run. Performing a manipulation of the argument options results in information disclosure. This vulnerability is reported as CVE-2026-104849. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in tinylibs Tinypool up to 2.1.1. It has been classified as problematic. This affects the function pool.run. The manipulation of the argument options with an unknown input leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. The summary by CVE is:

Tinypool is a minimal Node.js worker thread pool implementation. Prior to 2.1.2, Tinypool reads filename from a caller-supplied options object in pool.run(task, options) without requiring an own property, so a polluted Object.prototype.filename can replace the intended worker module. Applications are affected only when they pass their own second-argument options object to pool.run(); calls without that argument use the trusted default options object. An attacker who can first pollute the prototype can cause the worker pool to load attacker-selected JavaScript and can read or modify task data with the host process's privileges. This issue is fixed in version 2.1.2.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-104849 since 10/02/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

Upgrading to version 2.1.2 eliminates this vulnerability.

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Productinfo

Vendor

• tinylibs

Name

• Tinypool

Version

• 2.1.0
• 2.1.1

Website

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

CPE 2.3info

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CPE 2.2info

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