{"id":"UBUNTU-CVE-2026-116486","details":"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.","modified":"2026-10-28T20:17:33.932256808Z","published":"2026-10-26T14:16:00Z","upstream":["CVE-2026-116486"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-116486"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-116486"},{"type":"REPORT","url":"https://github.com/cveproject/cvelistv5/tree/main/cves/2026/116xxx/cve-2026-116486.json"},{"type":"REPORT","url":"https://github.com/easymock/objenesis"},{"type":"REPORT","url":"https://github.com/easymock/objenesis/blob/fb36e5c377ed1bf57a18386fa79d2eed4ddfcfac/main/src/main/java/org/objenesis/objenesisbase.java#l92-l95"},{"type":"REPORT","url":"https://github.com/easymock/objenesis/commit/40f90f435a06b16af74a7398f0007faeaa52c00c"},{"type":"REPORT","url":"https://github.com/easymock/objenesis/security/advisories/ghsa-743r-26gf-97ff"},{"type":"REPORT","url":"https://nvd.nist.gov/vuln/detail/cve-2026-116486"},{"type":"REPORT","url":"https://security-tracker.debian.org/tracker/cve-2026-116486"},{"type":"REPORT","url":"https://www.vulncheck.com/advisories/objenesis-before-3.6-type-confusion-via-class-name-instantiator-cache"}],"affected":[{"package":{"name":"objenesis","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/objenesis?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2+full-3"],"ecosystem_specific":{"binaries":[{"binary_version":"1.2+full-3","binary_name":"libobjenesis-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116486.json"}},{"package":{"name":"objenesis","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/objenesis?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1-2","2.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libobjenesis-java","binary_version":"2.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116486.json"}},{"package":{"name":"objenesis","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/objenesis?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6-1","3.0.1-2~18.04"],"ecosystem_specific":{"binaries":[{"binary_name":"libobjenesis-java","binary_version":"3.0.1-2~18.04"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116486.json"}},{"package":{"name":"objenesis","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/objenesis?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.0.1-2","3.1-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libobjenesis-java","binary_version":"3.1-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116486.json"}},{"package":{"name":"objenesis","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/objenesis?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.1-1","3.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libobjenesis-java","binary_version":"3.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116486.json"}},{"package":{"name":"objenesis","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/objenesis?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.3-3"],"ecosystem_specific":{"binaries":[{"binary_name":"libobjenesis-java","binary_version":"3.3-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116486.json"}},{"package":{"name":"objenesis","ecosystem":"Ubuntu:26.10","purl":"pkg:deb/ubuntu/objenesis?arch=source&distro=stonking"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libobjenesis-java","binary_version":"3.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116486.json"}},{"package":{"name":"objenesis","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/objenesis?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.4-2","3.4-2build1","3.5-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libobjenesis-java","binary_version":"3.5-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-116486.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L"},{"type":"CVSS_V4","score":"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"},{"type":"CVSS_V4","score":"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"},{"type":"Ubuntu","score":"medium"}]}