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CVE-2026-71253— Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON

Quick assessment

Affected
Apache Software Foundation Apache Johnzon
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Johnzon 存在“使用外部可控输入选择类或代码（不安全反射）”漏洞。 ClassConverter 会从不可信的 JSON 数据中加载并静态初始化由攻击者指定的类。 此漏洞影响 Apache Johnzon 1.0.0 至 2.2.0（不含 2.2.0）之间的所有版本。 建议用户升级至已修复该问题的版本：1.3.1（适用于 javax 命名空间）或 2.2.0（适用于 jakarta 规范命名空间）。

AI Predicted 9.8 Difficulty: Trivial

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Apache Software Foundation Apache Johnzon 2.0.0< 2.2.0 affected
1.0.0< 1.3.1 affected
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I. Basic Information for CVE-2026-71253

Vulnerability Information
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Vulnerability Title
Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用外部可控制的输入来选择类或代码(不安全的反射)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Johnzon 2.0.0 ~ 2.2.0 -

II. Public POCs for CVE-2026-71253

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III. Intelligence Information for CVE-2026-71253

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Mailing List Discussions for CVE-2026-71253 (1)

Same Patch Batch · Apache Software Foundation · 2026-10-19 · 62 CVEs total

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CVE-2026-79984 7.4 HIGH Apache Camel: camel-mina-sftp resolved the remote path of a polled file from the name repo
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CVE-2026-79986 7.4 HIGH Apache Camel: camel-azure-files resolved the remote path of a polled file from the name re
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CVE-2026-91858 6.5 MEDIUM Apache Camel: Camel-FOP Resolves External DTDs and Entities From Untrusted XSL-FO Input Wh
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CVE-2026-85314 6.5 MEDIUM Apache Camel: Camel-Mail Header Injection via Unfiltered mail.smtp Headers in the MimeMult
CVE-2026-85296 6.5 MEDIUM Apache Camel: Camel-AS2 Cross-Partner Signing Key Confusion via Shared Per-Request State

Showing top 20 of 62 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Apache Johnzon
Same vendor: Apache Software Foundation
Same weakness: CWE-470

V. Comments for CVE-2026-71253

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