CVE-2026-55388
CVE-2026-55388 · piscina: Prototype Pollution Gadget → RCE via inherited options.filename
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.1 · High · EPSS 0.5% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
piscina
- Versions
- < 4.9.3: Affected
- >= 5.0.0-alpha.0, < 5.2.0: Affected
- >= 6.0.0-rc.1, < 6.0.0-rc.2: Affected
No fix published
piscina npm
- Affected ranges
- SEMVER: ≥ 5.0.0-alpha.0, < 5.2.0
Update to 5.2.0
piscina npm
- Affected ranges
- SEMVER: < 4.9.3
Update to 4.9.3
piscina npm
- Affected ranges
- SEMVER: ≥ 6.0.0-rc.1, < 6.0.0-rc.2
Update to 6.0.0-rc.2