{"id":"CVE-2026-116486","published":"2026-10-26T14:16:37.200","lastModified":"2026-10-26T18:39:42.503","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.","cvssScore":4.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","cwes":["CWE-386"],"vendors":[],"products":[],"references":[{"url":"https://github.com/easymock/objenesis","tags":[]},{"url":"https://github.com/easymock/objenesis/blob/fb36e5c377ed1bf57a18386fa79d2eed4ddfcfac/main/src/main/java/org/objenesis/ObjenesisBase.java#L92-L95","tags":[]},{"url":"https://github.com/easymock/objenesis/commit/40f90f435a06b16af74a7398f0007faeaa52c00c","tags":[]},{"url":"https://github.com/easymock/objenesis/security/advisories/GHSA-743r-26gf-97ff","tags":[]},{"url":"https://www.vulncheck.com/advisories/objenesis-before-3.6-type-confusion-via-class-name-instantiator-cache","tags":[]}],"exploitRefs":[{"url":"https://github.com/easymock/objenesis","tags":[]},{"url":"https://github.com/easymock/objenesis/blob/fb36e5c377ed1bf57a18386fa79d2eed4ddfcfac/main/src/main/java/org/objenesis/ObjenesisBase.java#L92-L95","tags":[]},{"url":"https://github.com/easymock/objenesis/commit/40f90f435a06b16af74a7398f0007faeaa52c00c","tags":[]},{"url":"https://github.com/easymock/objenesis/security/advisories/GHSA-743r-26gf-97ff","tags":[]}],"hasPoc":true,"ai":null}