Is there a public exploit for CVE-2026-55388?

No public exploit for CVE-2026-55388 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-55388?

CVE-2026-55388 scores CVSS 8.1 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.48%.

What does CVE-2026-55388 affect?

CVE-2026-55388 affects piscinajs piscina.

8.1 High

piscina is a node.js worker pool implementation.

CVE-2026-55388

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 workerthreads.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.

Assessment

CVSS: 8.1 (v3.1)
Severity: High
EPSS: 0.48% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 22 June 2026
Last updated: 3 November 2026
Affected: piscinajs · piscina
Assigner: GitHub_M

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

At the source

EUVD (ENISA)

References

https://github.com/piscinajs/piscina/security/advisories/GHSA-x9g3-xrwr-cwfg

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