CVE-2026-101570

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Denial of Service in Oracle Helidon

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-webserver-http2). Supported versions that are affected are 4.0.0-4.5.5. Difficult to exploit vulnerability allows unauthenticated attacker with network access via HTTP/2 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 3.7 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L).

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Meta Information

Published

2026-10-20

Last Modified

2026-10-29

Generated

2026-11-10

AI Q&A

2026-10-21

EPSS Evaluated

2026-11-08

NVD

CVE-2026-101570

EUVD

EUVD-2026-105978

Affected Vendors & Products

Vendor	Product	Version / Range
Oracle Corporation	Helidon	4.0.0

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-webserver-http2 component. It affects versions 4.0.0 to 4.5.5. The issue allows an unauthenticated attacker with network access via HTTP/2 to partially disrupt the service by causing a denial of service (DOS).

Detection Guidance

This vulnerability affects Oracle Helidon versions 4.0.0 to 4.5.5 and can be exploited via HTTP/2. To detect it, check Helidon server versions using commands like 'java -jar helidon.jar --version' or inspect HTTP/2 response headers for affected versions. Monitor network traffic for partial denial of service patterns targeting Helidon services.

Impact Analysis

If you use the affected versions of Helidon, an attacker could exploit this to cause a partial denial of service, leading to reduced availability of the Helidon service. This may disrupt applications relying on it.

Compliance Impact

This vulnerability causes partial denial of service in the Helidon webserver component, which could disrupt availability of systems handling sensitive data. While not directly violating GDPR or HIPAA, such disruptions may impact compliance by impairing access to personal health or user data during outages.

Mitigation Strategies

Update Helidon to a version later than 4.5.5 as this vulnerability affects versions 4.0.0 to 4.5.5. Monitor network traffic for unusual HTTP/2 activity targeting Helidon components.

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