CVE-2026-101587

Deferred Deferred - Pending Action

Denial of Service in Oracle Helidon

Publication date: 2026-10-20

Last updated on: 2026-10-22

Assigner: Oracle

Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webclient-http1). 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 ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

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Meta Information

Published

2026-10-20

Last Modified

2026-10-22

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-101587

EUVD

EUVD-2026-105995

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-http1 component. It affects versions 4.0.0-4.5.5 and 27.0.0. The issue allows an unauthenticated attacker to cause a partial denial of service (DOS) by sending crafted HTTP requests over the network.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable versions of Helidon (4.0.0-4.5.5 or 27.0.0) in your environment. Inspect installed packages using commands like 'mvn dependency:tree' for Maven projects or 'npm list' for Node.js projects. Monitor network traffic for unusual HTTP requests targeting Helidon services.

Impact Analysis

If you use the affected versions of Helidon, an attacker could disrupt service availability by causing a partial denial of service. This may lead to degraded performance or temporary unavailability of applications relying on Helidon.

Compliance Impact

This vulnerability causes partial denial of service in Helidon, which could disrupt availability of affected systems. While not directly violating GDPR or HIPAA, such disruptions may impact compliance with availability requirements in these regulations if critical systems are affected.

Mitigation Strategies

Update Helidon to a version not affected by this vulnerability (4.0.0-4.5.5 and 27.0.0). Apply patches from Oracle as soon as they are available to address the HTTP-based denial of service risk.

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