{"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"}}]}}

{"dataType": "CVE_RECORD", "containers": {"cna": {"title": "Apache Johnzon: ClassConverter loads & static-initializes an attacker-named class from untrusted JSON", "source": {"discovery": "EXTERNAL"}, "credits": [{"lang": "en", "type": "finder", "value": "n0mi1k Security"}], "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"}]}], "affected": [{"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"}], "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"]}], "x_generator": {"engine": "Vulnogram 0.2.0"}, "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.", "supportingMedia": [{"type": "text/html", "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>", "base64": false}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-470", "description": "CWE-470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')"}]}], "providerMetadata": {"orgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "shortName": "apache", "dateUpdated": "2026-10-19T10:36:41.781Z"}}, "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": {"id": "CVE-2026-71253", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-20T19:34:08.742206Z"}}}], "providerMetadata": {"shortName": "CISA-ADP", "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "dateUpdated": "2026-10-20T19:34:22.369Z"}}]}, "cveMetadata": {"cveId": "CVE-2026-71253", "state": "PUBLISHED", "dateUpdated": "2026-10-19T10:36:41.781Z", "dateReserved": "2026-08-05T11:38:30.610Z", "assignerOrgId": "f0158376-9dc2-43b6-827c-5f631a4d8d09", "datePublished": "2026-10-19T10:36:41.781Z", "assignerShortName": "apache"}, "dataVersion": "5.2"}

{"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": "2026-10-20T20:17:24.763", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-71253", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-20T19:34:08.742206Z", "version": "2.0.3"}}]}, "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": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-470"}], "source": "security@apache.org", "type": "Secondary"}]}

{"bugzilla": {"description": "org.apache.johnzon/johnzon-mapper: Apache Johnzon: Arbitrary code execution via unsafe class loading", "id": "2555525", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555525"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.1", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-470", "details": ["A flaw was found in Apache Johnzon. This vulnerability allows a remote attacker to potentially execute arbitrary code by submitting a specially crafted JSON payload. Due to unsafe class loading in the ClassConverter component, the application loads and statically initializes an attacker-specified class from untrusted input."], "name": "CVE-2026-71253", "package_state": [{"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Out of support scope", "package_name": "johnzon-mapper", "product_name": "Red Hat Fuse 7"}], "public_date": "2026-10-19T10:36:41Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-71253\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-71253\nhttps://github.com/apache/johnzon/commit/91e7b0d21d08d138944e2570691939739422a3d6\nhttps://github.com/apache/johnzon/commit/dd3d00634c746a2173a2518e882e85e8a151bf30\nhttps://lists.apache.org/thread.html/3vgm1yo2sn9yhkvvs9lc4ro01vl3zt68"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[2.0.0,2.2.0)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[1.0.0,1.3.1)"}}], "enrichment": {"confidence": 80.0, "confidence_source": "matching", "scores": [{"score": 80.0, "source": "matching"}]}, "original": {"product": "Apache Johnzon", "source": "cna", "vendor": "Apache Software Foundation"}, "product": "johnzon", "vendor": "apache"}], "created": "2026-10-19T13:00:15.956117+00:00", "updated": "2026-10-20T20:45:14.119731+00:00", "vendors": ["apache", "apache$PRODUCT$johnzon"]}