CVE-2026-73921: Critical severity Oracle Helidon (Oracle Fusion Middleware) vulnerability

Published Aug 18, 2026

Updated

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 1.0.0-1.4.19. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in takeover of Helidon. CVSS 3.1 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Affected Software

2 affected components

Oracle Helidon (Oracle Fusion Middleware)=1.4.20

Oracle Helidon=1.4.20

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade Oracle Fusion Middleware Helidon (Imperative Web Server) to a version that resolves this vulnerability.
Fixed in 1.4.19

Event History

Aug 18, 2026

CVE Published

via MITRE·09:04 PM

Data Sourced

via MITRE·09:04 PM

DescriptionSeverity

Data Sourced

via NVD·09:18 PM

DescriptionSeverityWeaknessAffected Software

Frequently Asked Questions

Who is exposed to this vulnerability?

Deployments running the affected supported Helidon version 1.4.20 are exposed if an attacker can reach the Imperative Web Server over HTTP. No authentication or user interaction is required.

What level of access does an attacker need?

An unauthenticated attacker needs network access via HTTP. The vulnerability has low attack complexity and can be exploited without privileges.

What is the potential impact of successful exploitation?

Successful exploitation can result in takeover of Helidon, with high impact to confidentiality, integrity, and availability.