CVEvulnerability

CVE-2026-4634

7.5 HIGH Published 2026-04-02 Modified 2026-10-26 Official page ↗
Status
Modified
Published
2026-04-02
Last modified
2026-10-26
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 3.1 (0b0ca135-0b70-47e7-9f44-1890c2a1c46c)
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-1050

Description

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.

Affected configurations

• redhat build of keycloak • redhat build of keycloak 26.2 • redhat build of keycloak 26.2.15 • redhat build of keycloak 26.4 • redhat build of keycloak 26.4.11

Related

Weakness · CWE (1)

  • CWE-1050 Excessive Platform Resource Consumption within a Loop weakness

References