CVE-2026-116486
Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache
CVSS Score
4.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-386 |
| Vendor | easymock |
| Product | objenesis |
| Published | Oct 26, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low
Affected Versions
easymock / objenesis
0 < 3.6
References
github.com: https://github.com/easymock/objenesis/commit/40f90f435a06b16af74a7398f0007faeaa52c00c github.com: https://github.com/easymock/objenesis/security/advisories/GHSA-743r-26gf-97ff github.com: https://github.com/easymock/objenesis/blob/fb36e5c377ed1bf57a18386fa79d2eed4ddfcfac/main/src/main/java/org/objenesis/ObjenesisBase.java#L92-L95 github.com: https://github.com/easymock/objenesis vulncheck.com: https://www.vulncheck.com/advisories/objenesis-before-3.6-type-confusion-via-class-name-instantiator-cache
Credits
Yu Bao, PayPal Cyber Security Team