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CVE-2026-116486

Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache

2.0 LowFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

0.14%Unchanged since Oct 27, 2026
90%50%10%1%

What each source reports

CVE List Score used 2.0

Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache

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.

Record
CVE-2026-116486
CVSS 4.0
2.0 LowCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.5 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-386
Updated
2026-11-02
EUVDEUVD-2026-109813 2.0

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.

Record
EUVD-2026-109813
CVSS 4.0
2.0 LowCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-h635-rrqm-4mjq 2.0

Objenesis before 3.6 contains a type confusion vulnerability that allows code in one class loader...

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.

Record
GHSA-h635-rrqm-4mjq
CVSS 4.0
2.0 LowCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
4.5 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-386
Updated
2026-11-02
NVD 2.0

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.

Record
CVE-2026-116486
CVSS 4.0
2.0 LowCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
4.5 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-386
Updated
2026-11-02
OSV 2.0

Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache

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.

Record
CVE-2026-116486
CVSS 4.0
2.0 LowCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-386
Updated
2026-11-02
OSVDEBIAN-CVE-2026-116486 2.0

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.

Record
DEBIAN-CVE-2026-116486
CVSS 4.0
2.0 LowCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-116486 2.0

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.

Record
UBUNTU-CVE-2026-116486
CVSS 4.0
2.0 LowCVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
4.5 MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVAZL-111112 No score

CVE-2026-116486 affecting package objenesis 3.3-1

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.

Record
AZL-111112
Updated
2026-11-05
OSVAZL-111986 No score

CVE-2026-116486 affecting package javapackages-bootstrap 1.14.0-5

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.

Record
AZL-111986
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
objenesis
Azure Linux:3
 through 3.3-1 None known
javapackages-bootstrap
Azure Linux:3
 through 1.14.0-5 None known
objenesis
Debian:12
 All versions, plus listed versions
3.3-33.4-13.4-23.5-13.6-1
 None known
objenesis
Debian:13
 All versions, plus listed versions
3.4-23.5-13.6-1
 None known
objenesis
Debian:14
 before 3.6-1, plus listed versions
3.4-23.5-1
3.6-1
objenesis
Ubuntu:14.04:LTS
 All versions, plus listed versions
1.2+full-3
 None known
objenesis
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.1-22.2-1
 None known
objenesis
Ubuntu:18.04:LTS
 All versions, plus listed versions
2.6-13.0.1-2~18.04
 None known
objenesis
Ubuntu:20.04:LTS
 All versions, plus listed versions
3.0.1-23.1-1
 None known
objenesis
Ubuntu:22.04:LTS
 All versions, plus listed versions
3.1-13.2-1
 None known
objenesis
Ubuntu:24.04:LTS
 All versions, plus listed versions
3.3-3
 None known
objenesis
Ubuntu:26.10
 All versions, plus listed versions
3.5-1
 None known
objenesis
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.4-23.4-2build13.5-1
 None known

History

History
RecordedChangedSources
factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-116486 is a low vulnerability (CVSS 2.0) in Easymock Objenesis, published October 26, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.14%, the 2nd percentile. Fixed in objenesis 3.6-1.

References

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