CVE-2026-101581

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-dns-resolver-round-robin). 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 DNS to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some 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 (Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L).

CVSS Scores

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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-2026-101581

EUVD

EUVD-2026-105989

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-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability affects the Helidon product in Oracle Fusion Middleware, specifically the helidon-webclient-dns-resolver-round-robin component. It impacts versions 4.0.0-4.5.5 and 27.0.0. An unauthenticated attacker can exploit it via DNS to compromise Helidon, leading to unauthorized data modifications and partial denial of service.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable versions of Oracle Helidon. Inspect installed Helidon packages using commands like 'mvn dependency:tree' for Maven projects or 'java -jar helidon.jar --version' for standalone applications. Monitor network traffic for unusual DNS queries or partial service disruptions targeting Helidon services.

Impact Analysis

If you use affected Helidon versions, an attacker could modify or delete data in your system and cause disruptions, reducing availability. This could lead to data corruption or service outages for applications relying on Helidon.

Compliance Impact

This vulnerability could lead to unauthorized data modifications or disruptions, potentially violating integrity and availability requirements in GDPR and HIPAA. Compliance may be impacted if data integrity is compromised or services are disrupted.

Mitigation Strategies

Update Helidon to a version that is not affected by this vulnerability. Affected versions are 4.0.0-4.5.5 and 27.0.0. Apply patches provided by Oracle as soon as they are available.

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