Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON
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.
CVE-2026-71253
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-71253
Apache Johnzon
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "Apache Software Foundation",
"product": "Apache Johnzon",
"versions": [
{
"status": "affected",
"version": "2.0.0",
"lessThan": "2.2.0",
"versionType": "semver"
},
{
"status": "affected",
"version": "1.0.0",
"lessThan": "1.3.1",
"versionType": "semver"
}
],
"packageURL": "pkg:maven/org.apache.johnzon/johnzon-mapper",
"packageName": "org.apache.johnzon:johnzon-mapper",
"collectionURL": "https://repo.maven.apache.org/maven2",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-71253
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #42582 · Revision 1
- Added to Heist Feed
- Publisher date