CVE-2026-73927

Modified Modified - Updated After Analysis

Denial of Service in Helidon

Publication date: 2026-08-18

Last updated on: 2026-08-28

Assigner: Oracle

Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 3.0.0-3.2.19. 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).

CVSS Scores

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Meta Information

Published

2026-08-18

Last Modified

2026-08-28

Generated

2026-09-08

AI Q&A

2026-08-19

EPSS Evaluated

2026-09-06

NVD

CVE-2026-73927

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	helidon	3.2.20

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 is a denial-of-service (DoS) vulnerability in Oracle Helidon's Imperative Web Server component, specifically affecting version 3.2.20. An unauthenticated attacker can exploit it remotely via HTTP to crash or hang the server repeatedly, causing complete unavailability.

Detection Guidance

This vulnerability affects Oracle Helidon 3.2.20 via an unauthenticated HTTP request causing denial of service. To detect it, monitor for crashes or hangs in Helidon services. Check logs for repeated crashes or high CPU usage. Use network scanning tools like nmap to identify Helidon instances on port 8080 or similar. Test with a crafted HTTP request to see if the service becomes unresponsive.

Impact Analysis

If you use Oracle Helidon 3.2.20, an attacker could disrupt your web services by making them unavailable. This could lead to downtime, loss of service for users, and potential business disruptions.

Compliance Impact

This DoS vulnerability could lead to service unavailability, which may violate availability requirements in GDPR (Article 32) and HIPAA (Security Rule). Downtime could result in non-compliance if it affects data access or processing.

Mitigation Strategies

Upgrade Helidon to a version later than 3.2.20 to address the vulnerability. If immediate upgrade is not possible, restrict network access to the Imperative Web Server component via firewall rules or disable the affected service until patched.

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