piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env (piscinajs piscina)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.51 % · percentile 44 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Deferred
Description
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.
Weaknesses (CWE)
- CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes
References
- https://github.com/piscinajs/piscina/security/advisories/GHSA-67c8-pqhq-4rmx
- https://github.com/piscinajs/piscina/commit/0cb12fca37f526065b072592afe954574dcc656f
- https://github.com/piscinajs/piscina/commit/2f69f67159a0e48b38fd61fa4a91c2fdc19fff72
- https://github.com/piscinajs/piscina/commit/5be7bbb19e3787bb698862cd516121a578d690f7
- https://github.com/piscinajs/piscina/commit/bebbda255c2981cecddd36b171b94be2fd41c9a6
- https://github.com/piscinajs/piscina/releases/tag/v4.9.4
- https://github.com/piscinajs/piscina/releases/tag/v5.3.2
- https://github.com/piscinajs/piscina/releases/tag/v6.0.0-rc.5
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 4.0 | CRITICAL 9.2 | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N | GitHub_M |
| CVSS 4.0 | CRITICAL 9.2 | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-67c8-pqhq-4rmx — piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env
European references
- ENISA EUVD · EUVD-2026-90364
- GCVE · GCVE-0-2026-102992
Affected products
| Product | Versions |
|---|---|
| piscinajs · piscina | affected < 4.9.4 ; affected >= 5.0.0, < 5.3.2 ; affected >= 6.0.0-rc.1, < 6.0.0-rc.5 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |