CVE-2020-7770: JSON8 Project JSON8

Critical severity, CVSS 9.8. EPSS: 1.9% chance of exploitation in the next 30 days.

This affects the package json8 before 1.0.3. The function adds in the target object the property specified in the path, however it does not properly check the key being set, leading to a prototype pollution.

Affected products

• JSON8 Project JSON8: before 1.0.3 (fixed in 1.0.3)

Published 2020-11-12. Last modified 2026-06-17.