{"id":"CVE-2026-116486","aliases":["AZL-111112","AZL-111986","DEBIAN-CVE-2026-116486","EUVD-2026-109813","GHSA-743r-26gf-97ff","GHSA-h635-rrqm-4mjq","UBUNTU-CVE-2026-116486"],"status":"published","title":"Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","severity":{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00135,"percentile":0.0301,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-386"],"published":"2026-10-26T13:08:52Z","modified":"2026-11-05T05:40:51Z","fixes":[{"ecosystem":"Debian:14","package":"objenesis","fixed_in":["3.6-1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Azure Linux:3","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"3.3-1"}]}]},{"source":"osv","ecosystem":"Azure Linux:3","package":"javapackages-bootstrap","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"1.14.0-5"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3-3","3.4-1","3.4-2","3.5-1","3.6-1"]},{"source":"osv","ecosystem":"Debian:13","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4-2","3.5-1","3.6-1"]},{"source":"osv","ecosystem":"Debian:14","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.6-1"}]}],"versions":["3.4-2","3.5-1"]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2+full-3"]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1-2","2.2-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6-1","3.0.1-2~18.04"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.1-2","3.1-1"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1-1","3.2-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3-3"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"objenesis","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4-2","3.4-2build1","3.5-1"]}],"products":[{"vendor":"easymock","product":"objenesis"}],"references":[{"url":"https://github.com/easymock/objenesis/commit/40f90f435a06b16af74a7398f0007faeaa52c00c","tags":["patch","fix","report"]},{"url":"https://github.com/easymock/objenesis/security/advisories/GHSA-743r-26gf-97ff","tags":["vendor-advisory","advisory"]},{"url":"https://github.com/easymock/objenesis/blob/fb36e5c377ed1bf57a18386fa79d2eed4ddfcfac/main/src/main/java/org/objenesis/ObjenesisBase.java#L92-L95","tags":["technical-description","article"]},{"url":"https://github.com/easymock/objenesis","tags":["product","package","report"]},{"url":"https://www.vulncheck.com/advisories/objenesis-before-3.6-type-confusion-via-class-name-instantiator-cache","tags":["third-party-advisory","advisory","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116486","tags":["web","advisory"]},{"url":"https://github.com/advisories/GHSA-h635-rrqm-4mjq"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/116xxx/CVE-2026-116486.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-116486","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-116486","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-116486","tags":["report"]},{"url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/116xxx/cve-2026-116486.json","tags":["report"]},{"url":"https://github.com/easymock/objenesis/blob/fb36e5c377ed1bf57a18386fa79d2eed4ddfcfac/main/src/main/java/org/objenesis/objenesisbase.java#l92-l95","tags":["report"]},{"url":"https://github.com/easymock/objenesis/security/advisories/ghsa-743r-26gf-97ff","tags":["report"]},{"url":"https://nvd.nist.gov/vuln/detail/cve-2026-116486","tags":["report"]},{"url":"https://security-tracker.debian.org/tracker/cve-2026-116486","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-116486","title":"Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","status":"published","published":"2026-10-26T13:08:52.051Z","modified":"2026-10-26T16:15:59.231Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low","assessor":"cna"},{"version":"3.1","score":4.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-386"],"updated_at":"2026-11-02T14:20:03.827373Z"}],"euvd":[{"id":"EUVD-2026-109813","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","status":"published","published":"2026-10-26T13:08:52Z","modified":"2026-10-26T16:15:59Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T16:59:29.132426Z"}],"ghsa":[{"id":"GHSA-h635-rrqm-4mjq","title":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader...","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","status":"published","published":"2026-10-26T15:34:44Z","modified":"2026-10-26T15:34:52Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"},{"version":"3.1","score":4.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"}],"cwes":["CWE-386"],"updated_at":"2026-11-02T15:14:23.996006Z"}],"nvd":[{"id":"CVE-2026-116486","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","status":"published","published":"2026-10-26T14:16:37.2Z","modified":"2026-10-26T18:39:42.503Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":4.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium","assessor":"secondary"}],"cwes":["CWE-386"],"updated_at":"2026-11-02T14:13:03.452847Z"}],"osv":[{"id":"CVE-2026-116486","title":"Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","status":"published","published":"2026-10-26T13:08:52.051Z","modified":"2026-10-28T10:45:32.327172852Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-386"],"updated_at":"2026-11-02T15:44:56.675758Z"},{"id":"DEBIAN-CVE-2026-116486","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","status":"published","published":"2026-10-26T14:16:37.2Z","modified":"2026-10-27T07:00:40.485510433Z","cvss":[{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"}],"updated_at":"2026-11-02T15:45:50.923612Z"},{"id":"UBUNTU-CVE-2026-116486","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","status":"published","published":"2026-10-26T14:16:00Z","modified":"2026-10-28T20:17:33.932256808Z","cvss":[{"version":"3.1","score":4.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"},{"version":"3.1","score":4.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","level":"medium"},{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"},{"version":"4.0","score":2,"vector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T16:56:00.081948Z"},{"id":"AZL-111112","title":"CVE-2026-116486 affecting package objenesis 3.3-1","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","status":"published","published":"2026-10-26T14:16:37Z","modified":"2026-11-05T05:36:30Z","updated_at":"2026-11-05T16:41:18.705965Z"},{"id":"AZL-111986","title":"CVE-2026-116486 affecting package javapackages-bootstrap 1.14.0-5","description":"Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader to substitute objects into another by exploiting instantiator caching keyed on class name. When a shared ObjenesisStd instance caches instantiators by clazz.getName() in ObjenesisBase.getInstantiatorOf(), same-named classes collide, causing newInstance() to return wrong-class objects and ClassCastException failures.","status":"published","published":"2026-10-26T14:16:37Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:18.705965Z"}]}}