---
id: CVE-2026-101587
title: >-
  Vulnerability in the Helidon product of Oracle Fusion Middleware (component:
  helidon-webclient-http1)
summary: >-
  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 wit…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cvssSource: cna
vendor: Oracle Corporation
product: Helidon
affected:
  - Helidon >= 4.0.0 <= 4.5.5
  - Helidon 27.0.0
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T21:21:43.609Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-101587'
references:
  - url: 'https://www.oracle.com/security-alerts/cpuoct2026.html'
    label: Oracle Advisory
tags:
  - cve.org
ingestedAt: '2026-10-20T22:23:33.980Z'
---

## Overview

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).

## Affected

- `Helidon >= 4.0.0 <= 4.5.5`
- `Helidon 27.0.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.