CVE-2026-73927: High severity Oracle Helidon (Imperative Web Server) vulnerability
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).
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Helidon (Oracle Fusion Middleware) - Imperative Web Serverto a version that resolves this vulnerability.Fixed in 3.2.19 - Compensating control
Mitigate the HTTP-exposed Helidon Imperative Web Server vulnerability by restricting network access to the Helidon HTTP endpoint (e.g., allow only trusted clients) to prevent unauthenticated remote exploitation.
Event History
Frequently Asked Questions
Who can exploit this issue?
An unauthenticated attacker with network access to the affected Helidon Imperative Web Server can exploit it over HTTP. No user interaction or prior privileges are required.
What is the operational impact of successful exploitation?
Successful exploitation can cause Helidon to hang or crash repeatedly, resulting in a complete denial of service. The provided CVSS impact information indicates availability impact only, with no stated confidentiality or integrity impact.
Which deployment version is identified as affected?
The affected supported version identified in the advisory data is Helidon 3.2.20, specifically the Imperative Web Server component.