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High severity8.1NVD Advisory· Published Jun 22, 2026· Updated Jun 23, 2026

CVE-2026-55388

CVE-2026-55388

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
piscinanpm
>= 5.0.0-alpha.0, < 5.2.05.2.0
piscinanpm
< 4.9.34.9.3
piscinanpm
>= 6.0.0-rc.1, < 6.0.0-rc.26.0.0-rc.2

Affected products

27

Patches

Vulnerability mechanics

References

2

News mentions

0

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