Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON
CVSS score
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EPSS probability
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Risk score
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Published
12 h ago
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Vulnerability description
CVE AI research
DayBreach AI Explanation
Verified against sourcesSources read
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Source agreement
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Evidence confidence
%55
Short explanation
An Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability exists in Apache Johnzon. The ClassConverter loads and static-initializes an attacker-named class from untrusted JSON.
It allows attackers to load arbitrary classes during the processing of untrusted JSON inputs, creating potential security risks.
What should be done?
- Upgrade to version 1.3.1 (javax namespace) or 2.2.0 (jakarta specification namespace)
- Follow vendor advisories
Chain of evidence and sources
Zafiyet Apache Johnzon 1.0.0 sürümünden 2.2.0 öncesine kadar olan sürümleri etkilemektedir.
ClassConverter bileşeni güvenilmeyen JSON verilerinden sınıf yüklemekte ve statik olarak başlatmaktadır.
Show the technical text from the sources
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.
CWE: CWE-470
Explanation produced with the local gemini-flash-lite-latest model. Numerical metrics and the KEV, patch and exploit statuses are not determined by AI.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-71253 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | Apache Software Foundation | Apache Johnzon | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-71253 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-71253 weaknesses.
Official Sources and Advisories
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Weakness Type (CWE & CAPEC)
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