by Kastro
Paper/Archive/CVE-2026-71253

CVE-2026-71253

Apache Software Foundation Apache Johnzon — Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON

EPSS 0.4%CVSS 9.8
critical.is priorityof 100
36
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 31.9.319 × 206.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
Apache Johnzon2.0.0 – < 2.2.02.2.0CNA
Apache Johnzon1.0.0 – < 1.3.11.3.1CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

patchgithub.com/apache/johnzon/commit/dd3d00634c746a2173a2518e882e85e8a151bf30patchgithub.com/apache/johnzon/commit/91e7b0d21d08d138944e2570691939739422a3d6advisorylists.apache.org/thread.html/3vgm1yo2sn9yhkvvs9lc4ro01vl3zt68