CVE-2026-71253: org.apache.johnzon/johnzon-mapper: Apache Johnzon: Arbitrary code execution via unsafe class loading

Severity: Critical

CVSS Score: 9.8

Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Johnzon. ClassConverter loads & static-initializes an attacker-named class from untrusted JSON. This issue affects Apache Johnzon: from 1.0.0 before 2.2.0. Users are recommended to upgrade to version 1.3.1 (javax namespace) or 2.2.0 (jakarta specification namespace), which fixes the issue.