CVE-2021-3757: Immer Project Immer

Critical severity, CVSS 9.8. EPSS: 1.7% chance of exploitation in the next 30 days.

immer is vulnerable to Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Affected products

• Immer Project Immer: up to and including 9.0.5

Published 2021-09-02. Last modified 2026-06-17.