{"id":"CVE-2026-71253","state":"PUBLISHED","title":"Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON","description":"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.","publishedAt":"2026-10-19T10:36:41.781Z","updatedAt":"2026-10-20T19:34:25.835Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"apache","products":["Apache Software Foundation Apache Johnzon"],"affected":[{"vendor":"Apache Software Foundation","product":"Apache Johnzon","packageName":"org.apache.johnzon:johnzon-mapper","packageURL":"pkg:maven/org.apache.johnzon/johnzon-mapper","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThan":"2.2.0","versionType":"semver"},{"version":"1.0.0","status":"affected","lessThan":"1.3.1","versionType":"semver"}],"collectionURL":"https://repo.maven.apache.org/maven2"}],"references":["https://github.com/apache/johnzon/commit/dd3d00634c746a2173a2518e882e85e8a151bf30","https://github.com/apache/johnzon/commit/91e7b0d21d08d138944e2570691939739422a3d6","https://lists.apache.org/thread.html/3vgm1yo2sn9yhkvvs9lc4ro01vl3zt68"],"weaknesses":["CWE-470"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71253.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71253","state":"PUBLISHED","datePublished":"2026-10-19T10:36:41.781Z","dateUpdated":"2026-10-20T19:34:25.835Z","assignerShortName":"apache","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateReserved":"2026-08-05T11:38:30.610Z"},"containers":{"cna":{"title":"Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON","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."}],"affected":[{"vendor":"Apache Software Foundation","product":"Apache Johnzon","packageName":"org.apache.johnzon:johnzon-mapper","packageURL":"pkg:maven/org.apache.johnzon/johnzon-mapper","defaultStatus":"unaffected","versions":[{"version":"2.0.0","status":"affected","lessThan":"2.2.0","versionType":"semver"},{"version":"1.0.0","status":"affected","lessThan":"1.3.1","versionType":"semver"}],"collectionURL":"https://repo.maven.apache.org/maven2"}],"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"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-470","description":"CWE-470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"apache","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateUpdated":"2026-10-19T10:36:41.781Z"},"source":{"discovery":"EXTERNAL"},"credits":[{"lang":"en","value":"n0mi1k Security","type":"finder"}],"x_generator":{"engine":"Vulnogram 0.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-20T19:34:25.835Z"}}]}}}