GHSA-85c8-ppgw-ccpr: tinypool (CVE-2026-104849)

Package	Ecosystem	Affected	Fixed in
tinypool	npm	<2.1.2	2.1.2

Machine-written summary

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

Tinypool versions before 2.1.2 are affected. When a caller passes an options object to pool.run(), the filename option is read through the prototype chain, so an attacker who can pollute Object.prototype with a filename property can make tinypool load and run an attacker-controlled worker module. Exploitation requires that prototype pollution exists elsewhere in the application and that the application passes an options object to run(); the attacker can then redirect task data to a malicious worker. Upgrade to tinypool 2.1.2 or later, which contains the fix.

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 0.0049, the 42nd percentile, on 8 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.