CVE-2026-101572: High severity Oracle Helidon vulnerability
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: helidon-webclient-http2). Supported versions that are affected are 4.0.0-4.5.5 and 27.0.0. 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
Which deployments are exposed?
Oracle Helidon deployments using the helidon-webclient-http2 component on supported versions 4.0.0 through 4.5.5 or 27.0.0 are affected. The attack path is reachable over HTTP/2, so exposure depends on network accessibility of that interface.
Does an attacker need credentials or user interaction?
No. The vulnerability is described as easily exploitable by an unauthenticated attacker with network access via HTTP/2, with no user interaction required.
What is the expected impact of successful exploitation?
Successful exploitation can cause Helidon to hang or crash repeatedly, resulting in a complete denial of service. The stated impact is limited to availability; no confidentiality or integrity impact is specified.