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.
Metrics
Affected Vendors & Products
References
History
Thu, 02 Apr 2026 14:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| CPEs | cpe:/a:redhat:build_keycloak:26.4::el9 | |
| References |
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Thu, 02 Apr 2026 13:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | Keycloak: keycloak: denial of service via excessive processing of openid connect scope parameters | |
| First Time appeared |
Redhat
Redhat build Keycloak |
|
| Weaknesses | CWE-1050 | |
| CPEs | cpe:/a:redhat:build_keycloak: | |
| Vendors & Products |
Redhat
Redhat build Keycloak |
|
| References |
| |
| Metrics |
cvssV3_1
|
Status: PUBLISHED
Assigner: redhat
Published:
Updated: 2026-04-02T16:35:02.691Z
Reserved: 2026-03-23T08:41:40.650Z
Link: CVE-2026-4634
No data.
Status : Received
Published: 2026-04-02T13:16:27.027
Modified: 2026-04-02T14:16:33.590
Link: CVE-2026-4634
No data.
OpenCVE Enrichment
No data.