CVE-2026-73937

Modified Modified - Updated After Analysis

Denial of Service in Oracle 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 4.0.0-4.4.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 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 and unauthorized read access to a subset of Helidon accessible data. CVSS 3.1 Base Score 8.2 (Confidentiality and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/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

2026-09-07

NVD

CVE-2026-73937

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	helidon	4.5.0

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 vulnerability in Oracle Fusion Middleware's Helidon product, specifically in the Imperative Web Server component. It affects version 4.5.0 and allows an unauthenticated attacker to exploit it remotely via HTTP/2 without needing any privileges or user interaction. The vulnerability can cause a denial of service (DOS) by crashing the system repeatedly or hanging it, and it may also allow unauthorized read access to some data within Helidon.

Detection Guidance

Since this vulnerability affects Oracle Helidon 4.5.0 via HTTP/2, detection involves checking for vulnerable versions and unusual network traffic patterns. Inspect Helidon server logs for crashes or hangs. Use network scanning tools like Nmap to identify Helidon instances and their versions. Monitor for repeated crashes or high latency in Helikon services.

Impact Analysis

If you use Helidon 4.5.0, an attacker could exploit this to crash your system repeatedly or make it unresponsive, disrupting services. They might also access some of your data without permission. This could lead to downtime, data leaks, or loss of service availability.

Compliance Impact

This vulnerability could lead to unauthorized data access, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information. A successful attack could result in data breaches, leading to legal penalties, fines, or reputational damage due to non-compliance with these regulations.

Mitigation Strategies

Immediately upgrade Helidon to a version unaffected by this vulnerability. If upgrading is not possible, restrict network access to HTTP/2 ports or disable HTTP/2 support. Monitor network traffic for unusual patterns indicating exploitation attempts.

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