CVE-2026-101584

Deferred Deferred - Pending Action

Helidon WebClient WebSocket Information Disclosure and DoS

Publication date: 2026-10-20

Last updated on: 2026-10-29

Assigner: Oracle

Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webclient-websocket). Supported versions that are affected are 4.0.0-4.5.5 and 27.0.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized read access to a subset of Helidon accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 6.5 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L).

CVSS Scores

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Meta Information

Published

2026-10-20

Last Modified

2026-10-29

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-101584

EUVD

EUVD-2026-105992

Affected Vendors & Products

Vendor	Product	Version / Range
Oracle Corporation	Helidon	4.0.0
Oracle Corporation	Helidon	27.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-400	The product does not properly control the allocation and maintenance of a limited resource.

Attack-Flow Graph

Executive Summary

This is a vulnerability in Oracle Fusion Middleware's Helidon product, specifically in the helidon-webclient-websocket component. It affects versions 4.0.0-4.5.5 and 27.0.0. The issue allows an unauthenticated attacker to exploit it via HTTP network access, leading to unauthorized read access to some Helidon data and the ability to cause a partial denial of service.

Detection Guidance

Detection requires checking for vulnerable Helidon versions (4.0.0-4.5.5 or 27.0.0) and monitoring for unauthorized HTTP access attempts. Inspect server logs for unusual WebSocket connections or partial DOS indicators. Use network scanning tools like Nmap to identify Helidon services and verify versions.

Impact Analysis

If you use affected versions of Helidon, an attacker could access some of your data without permission and disrupt service availability. This could lead to data breaches or service interruptions, depending on your deployment.

Compliance Impact

This vulnerability could lead to unauthorized data access, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information. Compliance could be impacted if the exposed data includes regulated information.

Mitigation Strategies

Update Helidon to a version not affected by this vulnerability (4.5.6 or later for 4.x, or 27.0.1 or later for 27.x). If immediate update is not possible, restrict network access to the vulnerable component via firewalls or network segmentation.

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