Vulnerability in Easymock Objenesis
CVE-2026-116486
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.5 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/easymock/objenesis/commit/40f90f435a06b16af74a7398f0007faeaa52c00c (patch)
- github.com/easymock/objenesis/security/advisories/GHSA-743r-26gf-97ff (vendor-advisory)
- github.com/easymock/objenesis/blob/fb36e5c377ed1bf57a18386fa79d2eed4ddfcfac/mai… (technical-description)
- github.com/easymock/objenesis (product)
- www.vulncheck.com/advisories/objenesis-before-3.6-type-confusion-via-class-name… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-116486?
- CVE-2026-116486 is a medium-severity vulnerability in Easymock Objenesis, classified under CWE-386. CVSS score: 4.5/10. Published 2026-10-26.
- How severe is CVE-2026-116486?
- Medium severity. CVSS v3 base score is 4.5 out of 10.