Bug 2544267 (CVE-2026-102992)

Summary: CVE-2026-102992 piscina: piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: abuckta, dkuc, orabin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in piscina. This vulnerability allows an attacker to achieve arbitrary code execution by leveraging inherited configuration options. The worker pool stores options in a standard object that inherits base JavaScript properties without defining defaults for all sensitive parameters. An attacker who can manipulate shared object properties (prototype pollution) within the host application can inject malicious execution arguments, executing arbitrary code within worker threads or altering the runtime environment.
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Description OSIDB Bzimport 2026-09-30 20:26:03 UTC 
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.