CVE-2026-73934

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 3.0.0-3.2.18. 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. 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

EPSS 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-2026-73934

Affected Vendors & Products

Vendor	Product	Version / Range
oracle	helidon	3.2.19

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 vulnerability affects Oracle Fusion Middleware's Helidon product, specifically version 3.2.19. It allows an unauthenticated attacker to remotely exploit the Imperative Web Server component via HTTP/2, causing a denial of service (DOS) by hanging or crashing the system repeatedly.

Detection Guidance

To detect this vulnerability, monitor for unusual network traffic targeting the Helidon Imperative Web Server on port 80/443. Check for repeated crashes or hangs in Helidon logs. Use network scanners like Nmap to identify vulnerable versions (3.2.19) by querying the HTTP/2 service.

Impact Analysis

If exploited, this vulnerability could disrupt services by making the Helidon server unresponsive, leading to downtime and potential loss of availability for applications relying on it.

Compliance Impact

This vulnerability causes denial-of-service (DoS) conditions in Oracle Helidon, leading to system unavailability. Compliance with GDPR and HIPAA requires maintaining data availability and integrity; such disruptions could violate these standards by impairing access to critical data or services.

Mitigation Strategies

Immediately upgrade Helidon to a version unaffected by this vulnerability. If upgrading is not possible, restrict network access to the HTTP/2 service via firewalls or disable HTTP/2 temporarily. Monitor systems for signs of exploitation or instability.

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