4.5
MediumCVSS 3.1 · from VulnCheck
CVE-2026-116486
Objenesis before 3.6 Type Confusion via Class Name Instantiator Cache
objenesis · CWE-386 · CWE-386Affectedobjenesis
FixUpdate to 3.6 or newer
PublishedOct 26, 13:08 · VulnCheck
ScoredOct 26 · 4.5 · VulnCheck
Exploit code publicNone known · checked 22:18 UTC
ExploitedNone known · CISA KEV checked 22:30 UTC
What we know
No known exploitation. CISA KEV, checked 22:30 UTC.
No public exploit code known. Exploit-DB, Metasploit, Nuclei, checked 22:18 UTC.
An attacker needs local access to the machine. CVSS: local.
It only works under certain conditions, which makes it harder to pull off. CVSS: high attack complexity.
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.
From VulnCheck
Affected and fixed versions
ProductAffectedFixed inobjenesisbefore 3.63.6objenesisNot affected3.6
Exploit code
Exploit-DBnone knownMetasploitnone knownNucleinone known