Advisory severityCritical9.8Apache Software Foundation Updated

Critical [CVE-2026-71253] Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Johnzon

This critical-severity Apache Software Foundation advisory covers CVE-2026-71253 affecting Apache Johnzon.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-71253 Source published Oct 19, 2026Source updated Oct 21, 2026

VulniPulse record published Oct 19, 2026Record updated Oct 21, 2026

CVE-2026-71253

Affected products & platforms

Apache Software FoundationUnclassified

Open source advisory

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Summary

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 versions

1.0.0 before 2.2.0

Official advisory · high-confidence parse· fetched 2 days ago·verify at source

Fixed versions

2.2.0
1.3.1

Official advisory · high-confidence parse· fetched 2 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Users are recommended to upgrade to version 1.3.1 (javax namespace) or 2.2.0 (jakarta specification namespace), which fixes the issue.

Official advisory · high-confidence parse· fetched 2 days ago·verify at source

Sources

Official and corroborating records used to build this advisory.

Official vendor advisoryofficial
Official advisory page fetched and parsed; accepted detail fields are attributed to this page.
Apache Software Foundation
CVE.org CNA recordCVE.org
Independent CNA record used for near-real-time discovery and missed-CVE reconciliation. Discovered from the machine-readable feed https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/delta.json; this link opens the CVE.org record for CVE-2026-71253 instead of the raw feed document.
CVE Program

Cross-references

Validate CVE metadata against the authoritative registries.

CVE-2026-71253NVD CVE.org MITRE

Official resources

ASF Security — reporting & CVE process
Official documentation
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Apache project downloads (fixed releases)
Official documentation
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