GHSA-5gmw-xhrv-c9v3: tinypool (CVE-2026-104848)

Package	Ecosystem	Affected	Fixed in
tinypool	npm	<2.1.1	2.1.1

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Tinypool versions before 2.1.1 pass worker options to Node's worker_threads.Worker by reading them through the prototype chain, so a prototype-pollution flaw elsewhere in an application's dependencies can inject options such as execArgv or env. An attacker who can pollute Object.prototype can then make pool workers load attacker-controlled code, gaining code execution with the host process's privileges. Upgrade tinypool to version 2.1.1 or later, which the advisory lists as the fixed version.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
9.5	Critical	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0050, the 43rd percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 13:34 UTC First seen by agentprime
31 Oct 2026, 13:34 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.