CVE-2026-55388
piscina: Prototype Pollution Gadget → RCE via inherited options.filename
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.
INFO
Published Date :
June 22, 2026, 4:50 p.m.
Last Modified :
June 22, 2026, 4:50 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-55388
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update piscina to version 6.0.0-rc.2 or later.
- Update piscina to version 5.2.0 or later.
- Update piscina to version 4.9.3 or later.
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CVE-2026-55388 vulnerability anywhere in the article.