Is there a public exploit for CVE-2026-104849?

Yes. Proof-of-concept code for CVE-2026-104849 has been published publicly.

Is there a proof of concept for CVE-2026-104849?

Yes — 1 proof-of-concept entry is linked on this page, from public repositories and community submissions. They are listed for authorised testing only.

How severe is CVE-2026-104849?

CVE-2026-104849 scores CVSS 9.5 (v4.0), rated critical. EPSS puts the chance of exploitation in the next 30 days at 0.49%.

What does CVE-2026-104849 affect?

CVE-2026-104849 affects tinylibs tinypool.

9.5 Critical

Tinypool is a minimal Node.js worker thread pool implementation.

CVE-2026-104849

Tinypool is a minimal Node.js worker thread pool implementation. Prior to 2.1.2, Tinypool reads filename from a caller-supplied options object in pool.run(task, options) without requiring an own property, so a polluted Object.prototype.filename can replace the intended worker module. Applications are affected only when they pass their own second-argument options object to pool.run(); calls without that argument use the trusted default options object. An attacker who can first pollute the prototype can cause the worker pool to load attacker-selected JavaScript and can read or modify task data with the host process's privileges. This issue is fixed in version 2.1.2.

Proof-of-concept code is published

Public PoC

Public PoCCompleteTech-Security/tinypool-options-rce-check

Signals come from Exploit-DB, Metasploit, Nuclei and published proof-of-concept repositories. Their absence means nothing was found, not that nothing exists.

Assessment

CVSS: 9.5 (v4.0)
Severity: Critical
EPSS: 0.49% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Public PoC
Published: 2 October 2026
Last updated: 6 October 2026
Affected: tinylibs · tinypool
Weakness: CWE-1321, CWE-94
Assigner: security-advisories@github.com

CVSS vectorCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

At the source

References

Community proofs of concept

No community proof of concept yet. If you have one for a published vulnerability and the right to share it, add it below — it will appear here once reviewed.

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