Description
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 4.0.0-4.5.0. 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 hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Published: 2026-08-18
Score: 7.5 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

Oracle Helidon product (versions 4.0.0 through 4.5.0), the Imperative Web Server component of Oracle Fusion Middleware, contains a flaw in its access control that permits an unauthenticated attacker with network access via HTTP to force the server to either hang or crash. The vulnerability’s impact is limited to availability, as the CVSS v3.1 Base Score of 7.5 reflects a high availability effect with no impact on confidentiality or integrity.

Affected Systems

Supported Oracle Helidon versions that are impacted are 4.0.0 through 4.5.0, as indicated in the advisory. No other Helidon releases are listed as vulnerable.

Risk and Exploitability

Exploitation is possible from any remote host that can reach the Helidon server over HTTP. No user interaction or authentication is required, and the attack complexity is low. The EPSS score of less than 1% indicates a very low current probability of exploitation, and the vulnerability is not catalogued in CISA’s KEV. Nevertheless, a successful attack would immediately halt the Helidon service, causing a denial of service for all dependent applications.

Generated by OpenCVE AI on August 28, 2026 at 23:38 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply the security update for Oracle Helidon 4.5.1 or upgrade to a newer supported release as detailed in the Oracle security advisory
  • If an update is not immediately available, block external HTTP access to the Helidon service using a firewall or reverse proxy to restrict unauthenticated traffic
  • Place the Helidon service behind an authentication layer or network segmentation to limit exposure to the public network

Generated by OpenCVE AI on August 28, 2026 at 23:38 UTC.

Tracking

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Advisories

No advisories yet.

History

Sat, 29 Aug 2026 00:00:00 +0000

Type Values Removed Values Added
Title Oracle Helidon 4.5.1 Remote Denial of Service via Improper Access Control

Fri, 28 Aug 2026 19:45:00 +0000

Type Values Removed Values Added
Description Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.1. 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 hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 4.0.0-4.5.0. 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 hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
CPEs cpe:2.3:a:oracle:helidon:*:*:*:*:*:*:*:*

Thu, 20 Aug 2026 14:00:00 +0000

Type Values Removed Values Added
Title Oracle Helidon 4.5.1 Remote Denial of Service via Improper Access Control

Thu, 20 Aug 2026 03:00:00 +0000

Type Values Removed Values Added
Title Unauthenticated Denial-of-Service in Oracle Helidon 4.5.1

Wed, 19 Aug 2026 19:15:00 +0000

Type Values Removed Values Added
Title Unauthenticated Denial-of-Service in Oracle Helidon 4.5.1
Weaknesses CWE-400

Wed, 19 Aug 2026 17:15:00 +0000

Type Values Removed Values Added
Title Unauthenticated HTTP Denial of Service in Oracle Helidon 4.5.1

Wed, 19 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 19 Aug 2026 07:00:00 +0000

Type Values Removed Values Added
Title Unauthenticated HTTP Denial of Service in Oracle Helidon 4.5.1
Weaknesses CWE-400

Tue, 18 Aug 2026 21:15:00 +0000

Type Values Removed Values Added
Description Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.1. 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 hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
First Time appeared Oracle
Oracle helidon
CPEs cpe:2.3:a:oracle:helidon:4.5.1:*:*:*:*:*:*:*
Vendors & Products Oracle
Oracle helidon
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Subscriptions

Oracle Helidon
cve-icon MITRE

Status: PUBLISHED

Assigner: oracle

Published:

Updated: 2026-08-28T17:19:05.988Z

Reserved: 2026-08-13T18:41:45.891Z

Link: CVE-2026-73936

cve-icon Vulnrichment

Updated: 2026-08-19T13:59:32.573Z

cve-icon NVD

Status : Modified

Published: 2026-08-18T21:18:26.680

Modified: 2026-08-28T20:19:52.037

Link: CVE-2026-73936

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-28T23:45:03Z

Weaknesses