{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-71253", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "state": "PUBLISHED", "assignerShortName": "apache", "dateReserved": "2026-08-05T11:38:30.610Z", "datePublished": "2026-10-19T10:36:41.781Z", "dateUpdated": "2026-10-19T10:36:41.781Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-19T10:36:41.781Z"}, "title": "Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON", "problemTypes": [{"descriptions": [{"description": "CWE-470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')", "lang": "en", "cweId": "CWE-470", "type": "CWE"}]}], "source": {"discovery": "EXTERNAL"}, "affected": [{"vendor": "Apache Software Foundation", "product": "Apache Johnzon", "packageURL": "pkg:maven/org.apache.johnzon/johnzon-mapper", "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"}], "defaultStatus": "unaffected", "collectionURL": "https://repo.maven.apache.org/maven2", "packageName": "org.apache.johnzon:johnzon-mapper"}], "descriptions": [{"value": "Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Johnzon.\n\n\n\nClassConverter loads & static-initializes an attacker-named class from untrusted JSON.\n\n\n\n\nThis issue affects Apache Johnzon: from 1.0.0 before 2.2.0.\n\n\n\nUsers are recommended to upgrade to version 1.3.1 (javax namespace) or 2.2.0 (jakarta specification namespace), which fixes the issue.", "lang": "en", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Johnzon.</p><p>ClassConverter loads &amp; static-initializes an attacker-named class from untrusted JSON.<br></p><p>This issue affects Apache Johnzon: from 1.0.0 before 2.2.0.</p><p>Users are recommended to upgrade to version 1.3.1 (javax namespace) or 2.2.0 (jakarta specification namespace), which fixes the issue.</p>"}]}], "references": [{"url": "https://github.com/apache/johnzon/commit/dd3d00634c746a2173a2518e882e85e8a151bf30", "tags": ["patch"]}, {"url": "https://github.com/apache/johnzon/commit/91e7b0d21d08d138944e2570691939739422a3d6", "tags": ["patch"]}, {"url": "https://lists.apache.org/thread.html/3vgm1yo2sn9yhkvvs9lc4ro01vl3zt68", "tags": ["vendor-advisory"]}], "metrics": [{"other": {"type": "Textual description of severity", "content": {"text": "severity: LOW. Although a class initialiser can be triggered remotely it needs 2 separate preconditions: a) there must be a poisonous class-initialiser on the classpath (unlikely). b) there must be a REST POJO with a Class attribute on the project (unlikely as well)"}}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "credits": [{"lang": "en", "value": "n0mi1k Security", "type": "finder"}], "x_generator": {"engine": "Vulnogram 0.2.0"}}}}

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{"affected": [{"affectedData": [{"collectionURL": "https://repo.maven.apache.org/maven2", "defaultStatus": "unaffected", "packageName": "org.apache.johnzon:johnzon-mapper", "packageURL": "pkg:maven/org.apache.johnzon/johnzon-mapper", "product": "Apache Johnzon", "vendor": "Apache Software Foundation", "versions": [{"lessThan": "2.2.0", "status": "affected", "version": "2.0.0", "versionType": "semver"}, {"lessThan": "1.3.1", "status": "affected", "version": "1.0.0", "versionType": "semver"}]}], "source": "security@apache.org"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection') vulnerability in Apache Johnzon.\n\n\n\nClassConverter loads & static-initializes an attacker-named class from untrusted JSON.\n\n\n\n\nThis issue affects Apache Johnzon: from 1.0.0 before 2.2.0.\n\n\n\nUsers are recommended to upgrade to version 1.3.1 (javax namespace) or 2.2.0 (jakarta specification namespace), which fixes the issue."}], "id": "CVE-2026-71253", "lastModified": "2026-10-19T11:17:18.540", "metrics": {}, "published": "2026-10-19T11:17:18.540", "references": [{"source": "security@apache.org", "url": "https://github.com/apache/johnzon/commit/91e7b0d21d08d138944e2570691939739422a3d6"}, {"source": "security@apache.org", "url": "https://github.com/apache/johnzon/commit/dd3d00634c746a2173a2518e882e85e8a151bf30"}, {"source": "security@apache.org", "url": "https://lists.apache.org/thread.html/3vgm1yo2sn9yhkvvs9lc4ro01vl3zt68"}], "sourceIdentifier": "security@apache.org", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-470"}], "source": "security@apache.org", "type": "Primary"}]}

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