CVE-2026-83281: High severity Oracle Helidon vulnerability
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webserver). Supported versions that are affected are 4.0.0-4.5.4. Easily exploitable vulnerability allows unauthenticated attacker with network access via TCP 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
Event History
Frequently Asked Questions
Which deployments are exposed to this issue?
Oracle Helidon deployments using the helidon-webserver component in supported versions 4.0.0 through 4.5.4 are affected. Exposure requires network access to the service over TCP.
Does an attacker need credentials or user interaction to exploit it?
No. The issue is described as easily exploitable by an unauthenticated attacker with network access via TCP, and it requires no user interaction.
What is the expected impact of successful exploitation?
Successful exploitation can cause Helidon to hang or crash repeatedly, resulting in a complete denial of service. The stated impact is limited to availability; no confidentiality or integrity impact is listed.