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.

Project Subscriptions

Vendors Products
Easymock Subscribe
Objenesis Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 26 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Easymock
Easymock objenesis
Vendors & Products Easymock
Easymock objenesis

Mon, 26 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Mon, 26 Oct 2026 14:00:00 +0000

Type Values Removed Values Added
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.
Title Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache
Weaknesses CWE-386
References
Metrics cvssV3_1

{'score': 4.5, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L'}

cvssV4_0

{'score': 2, 'vector': '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'}


Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-26T16:15:59.231Z

Reserved: 2026-10-26T11:37:37.948Z

Link: CVE-2026-116486

cve-icon Vulnrichment

Updated: 2026-10-26T15:38:11.478Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-26T14:16:37.200

Modified: 2026-10-26T18:39:42.503

Link: CVE-2026-116486

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-26T18:50:39Z

Weaknesses