Medium severity · published Oct 26, 2026
CVE-2026-116486
Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache
New
4.5
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack vector
Local
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OB
objenesis · easymock
before 3.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-116486
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-116486
github.com
https://github.com/easymock/objenesis
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/commit/40f90f435a06b16af74a7398f0007faeaa52c00c
github.com
https://github.com/easymock/objenesis/security/advisories/GHSA-743r-26gf-97ff
www.vulncheck.com
https://www.vulncheck.com/advisories/objenesis-before-3.6-type-confusion-via-class-name-instantiator-cache