---
id: CVE-2026-83480
title: >-
  Vulnerability in the Helidon product of Oracle Fusion Middleware (component:
  WebSocket)
summary: >-
  Vulnerability in the Helidon product of Oracle Fusion Middleware (component:
  WebSocket).  Supported versions that are affected are 4.0.0-4.5.4. Easily
  exploitable vulnerability allows unauthenticated attacker with network access
  via HTTP…
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'
cwe:
  - CWE-400
vendor: oracle
product: helidon
affected:
  - 'helidon >= 4.0.0, <= 4.5.4'
published: '2026-09-15'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T19:27:37.587'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-83480'
references:
  - url: 'https://www.oracle.com/security-alerts/cspusep2026.html'
    label: secalert_us@oracle.com
tags:
  - nvd
  - cve.org
epss: 0.00402
epssPercentile: 0.31652
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-18T16:12:34.144812Z'
ingestedAt: '2026-09-15T20:44:02.553Z'
---

## Overview

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: WebSocket).  Supported versions that are affected are 4.0.0-4.5.4. 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, <= 4.5.4`

## Remediation

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