CVE-2021-23807: Janl Jsonpointer

Critical severity, CVSS 9.8. EPSS: 2.7% chance of exploitation in the next 30 days.

This affects the package jsonpointer before 5.0.0. A type confusion vulnerability can lead to a bypass of a previous Prototype Pollution fix when the pointer components are arrays.

Affected products

• Janl Jsonpointer: before 5.0.0 (fixed in 5.0.0)

Published 2021-11-03. Last modified 2026-06-17.