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CVE-2026-55388— piscina: Prototype Pollution Gadget → RCE via inherited options.filename

Quick assessment

Affected
piscinajs piscina
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Piscina Piscina是Piscina组织的一个Node.js工作线程池库。 Piscina存在安全漏洞，该漏洞源于原型污染，当调用者options对象没有filename作为自身属性时，两个读取操作都会通过原型链进行，攻击者利用原型链实现代码注入，允许攻击者在worker中运行任意.mjs文件。

CVSS 8.1 · High EPSS 0.45% · P37

Affected Version Matrix 3

VendorProduct Version RangeStatus
piscinajs piscina < 4.9.3 affected
>= 5.0.0-alpha.0, < 5.2.0 affected
>= 6.0.0-rc.1, < 6.0.0-rc.2 affected
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I. Basic Information for CVE-2026-55388

Vulnerability Information
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Vulnerability Title
piscina: Prototype Pollution Gadget → RCE via inherited options.filename
Source: CVE Program / CVE List V5
Vulnerability Description
piscina is a node.js worker pool implementation. Prior to 6.0.0-rc.2, 5.2.0, and 4.9.3, piscina's constructor and run() paths read the filename option via plain member access. Both reads fall through the prototype chain when the caller's options object doesn't have filename as an own property. When Object.prototype.filename is polluted upstream the inherited value flows to worker_threads.Worker import and the attacker's .mjs runs in the worker. This vulnerability is fixed in 6.0.0-rc.2, 5.2.0, and 4.9.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Piscina 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Piscina Piscina是Piscina组织的一个Node.js工作线程池库。 Piscina存在安全漏洞，该漏洞源于原型污染，当调用者options对象没有filename作为自身属性时，两个读取操作都会通过原型链进行，攻击者利用原型链实现代码注入，允许攻击者在worker中运行任意.mjs文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
piscinajs piscina < 4.9.3 -

II. Public POCs for CVE-2026-55388

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7145 chars
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III. Intelligence Information for CVE-2026-55388

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Vendor Advisories for CVE-2026-55388 (1)

IV. Related Vulnerabilities

Same product: piscina
Same vendor: piscinajs
Same weakness: CWE-94

V. Comments for CVE-2026-55388

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