CVE-2026-71253

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.

Score

CVSS 3.1 9.8 Critical

Status

Deferred - security@apache.org

Published

2026-10-19

Last modified

2026-10-20

Weaknesses

CWE-470

Affected products

• Apache Johnzon (Apache Software Foundation)

References

• https://github.com/apache/johnzon/commit/dd3d00634c746a2173a2518e882e85e8a151bf30
• https://github.com/apache/johnzon/commit/91e7b0d21d08d138944e2570691939739422a3d6
• https://lists.apache.org/thread.html/3vgm1yo2sn9yhkvvs9lc4ro01vl3zt68