CVE-2026-55388
Severity CVSS v4.0:
Pending analysis
Type:
CWE-94
Code Injection
Publication date:
22/06/2026
Last modified:
23/06/2026
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.
Impact
Base Score 3.x
8.10
Severity 3.x
HIGH