CVE-2023-26135: Flatnest Project Flatnest

Critical severity, CVSS 9.8. EPSS: 0.9% chance of exploitation in the next 30 days.

All versions of the package flatnest are vulnerable to Prototype Pollution via the nest() function in the flatnest/nest.js file.

Affected products

• Flatnest Project Flatnest: any version

Published 2023-06-30. Last modified 2026-06-17.