Tinypool: Prototype Pollution Gadget to RCE in run() options

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)
• Critical severity: CVSS 9.5

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

• tinypool 2.1.2Fixed version · GitHub Advisories · npm package tinypool: upgrade to 2.1.2 or later (affected < 2.1.2)

[ Packages ]Affected open-source packages

• tinypool npmAffected < 2.1.2 · fixed in 2.1.2 · GHSA-85c8-ppgw-ccpr

[ References ]References

• github.com/tinylibs/tinypool/commit/f41411a3e23324c674f35a19a3240f7a7c40ffbf
• github.com/tinylibs/tinypool/pull/135
• github.com/tinylibs/tinypool/releases/tag/v2.1.2
• github.com/tinylibs/tinypool/security/advisories/GHSA-85c8-ppgw-ccpr