CVE-2026-71253

critical · 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.

9.8

CVSS

0.4%

EPSS (exploit prob.)

32nd

EPSS percentile

2026-10-19

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-470

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-71253