CVE-2026-102992 · GHSA-67c8-pqhq-4rmx
piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env
- Risk score
- 72/100
- CVSS
- 9.2 v4.0
- Exploit chance (30 days)
- 0.4%
- Published
- 30 Sep 2026
Open in the live forecast Today's forecast
What to know
- What it 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 option…
- Affected
- piscina (npm) >= 5.0.0, < 5.3.2; piscina (npm) < 4.9.4; piscina (npm) >= 6.0.0-rc.1, < 6.0.0-rc.5
- Fix
- Upgrade piscina to 5.3.2 or 4.9.4 or 6.0.0-rc.5 (whichever matches your release line) or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 9.2 critical
- Remotely exploitable without logging in
- On your watchlist: npm
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| piscina | npm | >= 5.0.0, < 5.3.2 | 5.3.2 |
| piscina | npm | < 4.9.4 | 4.9.4 |
| piscina | npm | >= 6.0.0-rc.1, < 6.0.0-rc.5 | 6.0.0-rc.5 |
References
- https://github.com/advisories/GHSA-67c8-pqhq-4rmx
- https://github.com/piscinajs/piscina/security/advisories/GHSA-67c8-pqhq-4rmx
- https://nvd.nist.gov/vuln/detail/CVE-2026-102992
- 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
Original 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.
Last activity 30 Sep 2026. Patch Forecast updates every hour.