Bug 2555525 (CVE-2026-71253) - CVE-2026-71253 org.apache.johnzon/johnzon-mapper: Apache Johnzon: Arbitrary code execution via unsafe class loading
Summary: CVE-2026-71253 org.apache.johnzon/johnzon-mapper: Apache Johnzon: Arbitrary c...
Keywords:
Status: NEW
Alias: CVE-2026-71253
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-19 10:55 UTC by OSIDB Bzimport
Modified: 2026-10-19 15:20 UTC (History)
4 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-10-19 10:55:34 UTC 
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.
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