Vulnerability details
CVE-2026-71253
Apache Software Foundation Apache Johnzon
Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON
CVSS 3.1
9.8Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.8Critical | 3.1 | CISA ADP / Vulnrichment (CISA-ADP) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Apache Software Foundation | Apache Johnzon | 1.0.0 ≤ v < 1.3.1 | CVEProject cvelistV5 (CNA) |
| Apache Software Foundation | Apache Johnzon | 2.0.0 ≤ v < 2.2.0 | CVEProject cvelistV5 (CNA) |
References and advisories
3
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Details
- Published
- 2026-10-19
- Last updated
- 2026-10-20
- State
- Published
- Assigner (CNA)
- apache
- Kolun priority
- 23 · Low
Exploit prediction (EPSS)
0.38%
Probability of exploitation in 30 days
32.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-470Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')