CVE-2026-83459

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-15 · updated 2026-09-28
Weakness: CWE-400

Description

Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-media-multipart). Supported versions that are affected are 3.0.0-3.2.20. 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 partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

Affected products

Oracle Corporation Helidon: from 3.0.0 before 3.2.20 — fixed in 3.2.20

How to fix

Upgrade to a fixed version: Oracle Corporation Helidon 3.2.20. Check the vendor advisory for mitigations.

References

https://www.oracle.com/security-alerts/cspusep2026.html

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