CVE-2026-94114
Description
A flaw was found in Apache Commons BCEL (Byte Code Engineering Library). When loading untrusted classes, the library caches them under their internally declared names without verifying them against the requested class name. A remote attacker could exploit this vulnerability to substitute legitimate classes with attacker-controlled ones, allowing them to bypass security verification checks and compromise application logic.
Statement
This vulnerability is rated as Moderate severity because exploitation requires an application to process untrusted or maliciously crafted Java class files, and high attack complexity is needed to influence name lookups in shared class caches. In Red Hat environments, Apache Commons BCEL is primarily used in migration utilities and build tooling rather than in continuously exposed network services processing arbitrary bytecode. Consequently, typical production deployments do not expose the affected class caching mechanism to untrusted input.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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 | 5.9 | N/A | 5.9 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | High | N/A | High |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
cve.org: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
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