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Fencer Intel
medium 4.5

CVE-2026-116486 json

Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache

published 14d ago modified 14d ago also EUVD-2026-109813

cvss
4.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits
0
none known

Summary

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.

Patch / fix

  • easymock objenesis 3.6
  • objenesis Debian 14 3.6-1

debian advisories DEBIAN-CVE-2026-116486

Is CVE-2026-116486 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-116486 updated cvss 4.5

org.objenesis/objenesis: objenesis: Type confusion via instantiator cache collisions

  • Red Hat Exploit Intelligence exploit-intelligence/agent-client-rhel9
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenShift Serverless openshift-serverless-1/kn-ekb-receiver-rhel9, openshift-serverless-1/kn-ekb-dispatcher-rhel9 Red Hat build of Apache Camel 4 for Quarkus 3 objenesis 2.1.0.redhat-00002 Red Hat build of Apache Camel for Spring Boot 4 objenesis 2.1.0.redhat-00002 Red Hat build of Apicurio Registry 3 objenesis 2.1.0.redhat-00002 Red Hat Ceph Storage 7 liborc1 Red Hat Ceph Storage 8 liborc1
    +5 more products
    Red Hat Ceph Storage 9 liborc, liborc2 Red Hat Enterprise Linux 8 objenesis, powermock, powermock-core, powermock-common, powermock-junit4, powermock-testng, +6 more Red Hat Enterprise Linux 9 jmc, objenesis 3.3-10.el10 Red Hat Enterprise Linux 10 objenesis 3.3-10.el10 Red Hat Enterprise Linux AI (RHEL AI) 3 bazel6 6.5.0-2.el9ai, bazel7 7.7.1-1.el9ai, bazel8 8.6.0-1.el9ai
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Fuse 7 objenesis 2.1.0.redhat-00002
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat OpenShift AI (RHOAI) rhoai/odh-spark-operator-rhel9, rhoai/odh-trustyai-service-rhel9, rhoai/odh-th-torch-cpu-py312-rhel9, rhoai/odh-th-torch-cuda-py312-rhel9, rhoai/odh-th06-cpu-torch210-py312-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, +3 more
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images maven3.9 3.9.16-0.5.hum1
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
14d ago

Exploit prediction

0.14% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 4.0 2.0 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
CNA 3.1 4.5 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
CNA 4.0 2.0 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/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

Affected products

  • easymock objenesis

Classification

Weakness
  • CWE-386 Symbolic Name not Mapping to Correct Object

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.