CVE-2026-83281: Oracle Helidon

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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 products

• Oracle Helidon: from 4.0.0, up to and including 4.5.4

Published 2026-09-15. Last modified 2026-09-28.