# piscina (npm) vulnerabilities

2 known vulnerabilities (1 critical, 1 high), with the versions each affects and the releases that fix them.

## At a glance

- Latest release: 5.3.2 (Aug 28, 2026): no advisory affects it
- Newest unaffected release: 5.3.2 (Aug 28, 2026), the latest release
- Weekly downloads: 17M
- Dependents: 413
- Releases: 57 since 1.0.0 (May 1, 2020)
- Registry: https://www.npmjs.com/package/piscina
- Releases read: Nov 8, 2026

## Version timeline

Affected versions per advisory, in version order:

- CVE-2026-102992: 1.0.0-pre to 4.9.3 (4.9.4 is outside it); 5.0.0 to 5.3.1 (5.3.2 is outside it); 6.0.0-rc.1 to 6.0.0-rc.4 (6.0.0-rc.5 is outside it)
- CVE-2026-55388: 1.0.0-pre to 4.9.2 (4.9.3 is outside it); 5.0.0-alpha.0 to 5.1.4 (5.2.0 is outside it); 6.0.0-rc.1 (6.0.0-rc.2 is outside it)

## Advisories (2)

### [CVE-2026-102992](https://cve.now/CVE-2026-102992): piscina: Prototype-pollution gadget in ThreadPool.options allows RCE via execArgv / loadBalancer / env

- Severity: Critical 9.2
- Published: Sep 30, 2026
- Affected: from 5.0.0, fixed in 5.3.2; fixed in 4.9.4; from 6.0.0-rc.1, fixed in 6.0.0-rc.5.
- Fixed in 4.9.4 (released Aug 28, 2026, 33 days before disclosure), 5.3.2 (released Aug 28, 2026, 33 days before disclosure) and 6.0.0-rc.5 (released Aug 28, 2026, 33 days before disclosure).
- The latest release, 5.3.2, is not affected.
- 52% of piscina downloads last week were affected versions (10.1M).

### [CVE-2026-55388](https://cve.now/CVE-2026-55388): piscina: Prototype Pollution Gadget → RCE via inherited options.filename

- Severity: High 8.1
- Published: Jun 22, 2026
- Affected: from 5.0.0-alpha.0, fixed in 5.2.0; fixed in 4.9.3; from 6.0.0-rc.1, fixed in 6.0.0-rc.2.
- Fixed in 4.9.3 (released Jun 12, 2026, 10 days before disclosure), 5.2.0 (released Jun 12, 2026, 10 days before disclosure) and 6.0.0-rc.2 (released Jun 12, 2026, 10 days before disclosure).
- The latest release, 5.3.2, is not affected.
- 39% of piscina downloads last week were affected versions (7.4M).

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