{"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":"2026-10-20T19:34:25.835Z"},"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"}},"adp":[{"metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":9.8,"attackVector":"NETWORK","baseSeverity":"CRITICAL","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-10-20T19:34:08.742206Z","id":"CVE-2026-71253","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-20T19:34:25.835Z"}}]}}