CVE-2026-101586: Medium severity Oracle Helidon vulnerability

Q: Which deployments are exposed to this issue?

Helidon deployments using the helidon-webclient component are affected if they run supported versions 4.0.0 through 4.5.5 or version 27.0.0 and are reachable over HTTP from an attacker's network location.

Q: Does exploitation require credentials or user interaction?

No. The vulnerability is described as easily exploitable by an unauthenticated attacker with network access via HTTP, with no user interaction required.

Q: What could an attacker obtain through successful exploitation?

Successful exploitation can provide unauthorized read access to a subset of data accessible to Helidon. The stated impact is limited to confidentiality; integrity and availability impacts are not identified.

Published Oct 20, 2026

Updated

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webclient). 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. CVSS 3.1 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).

Affected Software

1 affected component

Oracle Helidon>=4.0.0<=4.5.5, =27.0.0

Event History

Oct 20, 2026

CVE Published

via MITRE·09:21 PM

Data Sourced

via MITRE·09:21 PM

DescriptionSeverity

Data Sourced

via NVD·10:18 PM

DescriptionSeverity

Frequently Asked Questions

Which deployments are exposed to this issue?

Helidon deployments using the helidon-webclient component are affected if they run supported versions 4.0.0 through 4.5.5 or version 27.0.0 and are reachable over HTTP from an attacker's network location.

Does exploitation require credentials or user interaction?

No. The vulnerability is described as easily exploitable by an unauthenticated attacker with network access via HTTP, with no user interaction required.

What could an attacker obtain through successful exploitation?

Successful exploitation can provide unauthorized read access to a subset of data accessible to Helidon. The stated impact is limited to confidentiality; integrity and availability impacts are not identified.

CVE-2026-101586: Medium severity Oracle Helidon vulnerability

Affected Software

Event History

Frequently Asked Questions

Which deployments are exposed to this issue?

Does exploitation require credentials or user interaction?

What could an attacker obtain through successful exploitation?

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Frequently Asked Questions

Which deployments are exposed to this issue?

Does exploitation require credentials or user interaction?

What could an attacker obtain through successful exploitation?