Status: UPDATED
| Advisory ID: CVE-2026-4634
Key Details
| CVE | CVE-2026-4634 |
| CVSS Score / Version | 7.5 (High) / CVSS v3.1 |
| Updated | 2026-10-06 |
| CVSS Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CVSS Prose | attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is none; availability impact is high. |
| Affected products | Red Hat Build of Keycloak, Red Hat RHEL-8 based Middleware Containers, Red Hat build of Keycloak 26.2, and Red Hat build of Keycloak 26.4 |
| Classified as | CWE-1050 (Excessive Platform Resource Consumption within a Loop) |
Affected Products, Subsystems & Sectors
| Subsystems | OT Supporting Infrastructure |
| Sectors | Multiple |
What to Know
A flaw was found in Keycloak. An unauthenticated attacker can exploit this vulnerability by sending a specially crafted POST request with an excessively long scope parameter to the OpenID Connect (OIDC) token endpoint. This leads to high resource consumption and prolonged processing times, ultimately resulting in a Denial of Service (DoS) for the Keycloak server. (NVD)
What to Do
Monitor Red Hat's web page for any future patch releases. See vendor advisory link below.
References