piscinajs piscina up to 4.9.3/5.3.1/6.0.0-rc.4 ThreadPool Options src/index.ts execArgv/loadBalancer/env code injection

Summaryinfo

A vulnerability marked as critical has been reported in piscinajs piscina up to 4.9.3/5.3.1/6.0.0-rc.4. Affected is an unknown function of the file src/index.ts of the component ThreadPool Options. The manipulation of the argument execArgv/loadBalancer/env leads to code injection. This vulnerability is uniquely identified as CVE-2026-102992. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in piscinajs piscina up to 4.9.3/5.3.1/6.0.0-rc.4 and classified as critical. This issue affects an unknown code of the file src/index.ts of the component ThreadPool Options. The manipulation of the argument execArgv/loadBalancer/env with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

piscina is a node.js worker pool implementation. Prior to 4.9.4, 5.3.2, and 6.0.0-rc.5, Piscina stores ThreadPool.options in src/index.ts as a plain object that inherits from Object.prototype. Applications with a separate prototype-pollution primitive can therefore supply inherited values for security-sensitive options that do not have own defaults. An inherited execArgv value is passed to the Node.js Worker constructor and can preload attacker-controlled code in worker threads, an inherited loadBalancer function can execute during task scheduling, and inherited env values can alter worker environments. This issue is fixed in versions 4.9.4, 5.3.2, and 6.0.0-rc.5.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-102992 since 09/29/2026. The exploitation is known to be easy. The attack may be initiated remotely. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059 according to MITRE ATT&CK.

Upgrading to version 4.9.4, 5.3.2 or 6.0.0-rc.5 eliminates this vulnerability.

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Productinfo

Vendor

• piscinajs

Name

• piscina

Version

• 4.9.0
• 4.9.1
• 4.9.2
• 4.9.3
• 5.3.0
• 5.3.1
• 6.0.0-rc.0
• 6.0.0-rc.1
• 6.0.0-rc.2
• 6.0.0-rc.3
• 6.0.0-rc.4

Website

• Product: https://github.com/piscinajs/piscina/

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