PT-2026-29731 · Red Hat · Red Hat Build Of Keycloak

Published 2026-04-02 · Updated 2026-04-02 · CVE-2026-4634

Mitre

CVSS v3.1

7.5

High

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

Weakness Enumeration

CWE-1050

Related Identifiers

CVE-2026-4634

Affected Products

Red Hat Build Of Keycloak

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-4634 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2450250 · Note
• https://access.redhat.com/security/cve/CVE-2026-4634 · Note