piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env
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.
CVE-2026-102992
Primary source · Revision 2
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-102992
piscina
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "piscinajs",
"product": "piscina",
"versions": [
{
"status": "affected",
"version": "< 4.9.4"
},
{
"status": "affected",
"version": ">= 5.0.0, < 5.3.2"
},
{
"status": "affected",
"version": ">= 6.0.0-rc.1, < 6.0.0-rc.5"
}
]
}
]- Related CVEs
- CVE-2026-102992
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #61027 · Revision 2
- Added to Heist Feed
- Publisher date