CVE-2026-116486
Description
A flaw was found in Objenesis. The library caches object instantiators using only the class name rather than the unique class identity across separate class loaders. A local attacker can exploit this behavior in shared caching environments with identically named classes to induce type confusion. Successful exploitation allows unexpected object substitution, potentially resulting in application crashes or data integrity issues.
Statement
A flaw was found in the Objenesis library's instantiator caching mechanism, which caches objects using only the class name rather than the unique class identity. A local attacker can exploit this in shared environments by loading identically named classes across different class loaders to induce type confusion. This results in unexpected object substitution, leading to application crashes or data integrity corruption.
Mitigation
Do not share a single Objenesis instance across multiple class loaders within the same application. Instantiate separate, isolated Objenesis instances for each class loader environment to prevent cache collisions.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.5 | N/A | 4.5 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | High |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | Low | N/A | Low |
| Integrity Impact | Low | N/A | Low |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
cve.org: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
When the product accesses the resource using an incompatible type, this could trigger logical errors because the resource does not have expected properties.
Availability,Integrity,Confidentiality
Technical Impact: Read Memory; Modify Memory; Execute Unauthorized Code or Commands; DoS: Crash, Exit, or Restart
If a memory buffer is accessed using an incompatible type, and the allocated buffer is smaller than the type that the code is attempting to access, then an attacker could read or write memory outside the bounds of the buffer, leading to a crash or possibly code execution.
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