CVE-2026-87289 Denial of service in Helidon

High 7.5 Published 15 Sep 2026 Updated 15 Sep 2026

An unauthenticated attacker can cause a complete denial of service in Helidon web server via HTTP requests.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-87289?

CVE-2026-87289 is a high-severity denial of service vulnerability in Oracle Helidon, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webserver-static-content). Supported versions that are affected are 4.0.0-4.5.4. 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).

Weakness: CWE-400

Which versions are affected by CVE-2026-87289?

It affects 1 product.

Products include Oracle Helidon.

How do I fix CVE-2026-87289?

No fix has been published for CVE-2026-87289 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-87289 being exploited?

There is no known exploitation of CVE-2026-87289 in the wild and no public exploit code.

All Oracle Helidon vulnerabilities

Sources

Also known as GHSA-683w-v5xf-4gr4.