CVE-2021-23663: Sey Project Sey

Critical severity, CVSS 9.8. EPSS: 1.2% chance of exploitation in the next 30 days.

All versions of package sey are vulnerable to Prototype Pollution via the deepmerge() function.

Affected products

• Sey Project Sey: any version

Published 2021-12-10. Last modified 2026-06-17.