CVE-2026-83280: High severity Oracle Helidon vulnerability
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webserver-http2). Supported versions that are affected are 4.0.0-4.5.4. 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).
Affected Software
Event History
Frequently Asked Questions
Who is exposed to exploitation?
Helidon deployments using the helidon-webserver-http2 component on affected supported versions 4.0.0 through 4.5.4 are exposed if an attacker can reach them over HTTP/2. No authentication or user interaction is required.
What is the practical impact of a successful attack?
An attacker can cause Helidon to hang or crash repeatedly, resulting in a complete denial of service. The reported impact is limited to availability; no confidentiality or integrity impact is stated.
How difficult is exploitation?
The vulnerability is described as easily exploitable with low attack complexity. The attacker needs network access via HTTP/2 and does not need privileges.