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vuln-cve/data/2026/71xxx/CVE-2026-71253.json
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{
"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"
},
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"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"
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"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",
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"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"
}
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"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",
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"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"
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{
"url": "https://github.com/apache/johnzon/commit/91e7b0d21d08d138944e2570691939739422a3d6",
"tags": [
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},
{
"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)"
}
},
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{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"credits": [
{
"lang": "en",
"value": "n0mi1k Security",
"type": "finder"
}
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"x_generator": {
"engine": "Vulnogram 0.2.0"
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"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"
}
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],
"title": "CISA ADP Vulnrichment",
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"dateUpdated": "2026-10-20T19:34:25.835Z"
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}