CVE-2026-102495
Description
A flaw was found in Apache XMLSchema. The parser does not properly restrict how deeply schema imports and includes can be nested during processing. A remote attacker could provide a crafted schema with deeply nested references, triggering unbounded recursion that exhausts the call stack. This flaw leads to an application crash, resulting in a Denial of Service (DoS).
Statement
This flaw is rated as having an Important severity because unauthenticated remote attackers can crash application runtimes by submitting crafted definitions to services parsing untrusted XML schemas. In environments such as Red Hat JBoss Fuse or Enterprise Application Platform, services that dynamically resolve nested schema dependencies can experience JVM stack exhaustion and complete denial of service. The blast radius is limited to service availability, as the issue does not permit remote code execution or unauthorized data exposure.
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 | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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