CVE-2026-71166: Critical severity Oracle Helidon vulnerability
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). Supported versions that are affected are 3.0.0-3.2.17. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Helidon accessible data as well as unauthorized access to critical data or complete access to all Helidon accessible data and unauthorized ability to cause a partial denial of service (partial DOS) of Helidon. CVSS 3.1 Base Score 9.4 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L).
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Helidon (Oracle Fusion Middleware) - Imperative Web Serverto a version that resolves this vulnerability.Fixed in 3.0.0-3.2.17
Event History
Frequently Asked Questions
Which deployments should be prioritized for remediation?
Prioritize Oracle Helidon deployments using the Imperative Web Server component on supported version 3.2.18, particularly where the server is reachable over HTTP from untrusted networks.
Does an attacker need an account or user interaction to exploit this issue?
No. The vulnerability is described as easily exploitable by an unauthenticated attacker with network access via HTTP, and the CVSS vector indicates no privileges or user interaction are required.
How can I identify potentially affected instances?
Check whether the deployment uses Helidon's Imperative Web Server component and is running version 3.2.18. That is the supported affected version identified in the available information.