CVE-2026-4634 (GCVE-0-2026-4634)

Vulnerability from cvelistv5 – Published: 2026-04-02 12:44 – Updated: 2026-04-03 17:23
VLAI?
Title
Keycloak: keycloak: denial of service via excessive processing of openid connect scope parameters
Summary
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.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-1050 - Excessive Platform Resource Consumption within a Loop
Assigner
References
https://access.redhat.com/errata/RHSA-2026:6475 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6476 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6477 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:6478 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2026-4634 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2450250 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version
Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2.15-1 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.2::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2-18 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.2::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2 Unaffected: 26.2-18 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.2::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.2.15     cpe:/a:redhat:build_keycloak:26.2::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.4 Unaffected: 26.4.11-1 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.4::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.4 Unaffected: 26.4-14 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.4::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.4 Unaffected: 26.4-14 , < * (rpm)
    cpe:/a:redhat:build_keycloak:26.4::el9
 Create a notification for this product.
    Red Hat Red Hat build of Keycloak 26.4.11     cpe:/a:redhat:build_keycloak:26.4::el9
 Create a notification for this product.
Date Public ?
2026-04-02 12:30
Credits
Red Hat would like to thank Slvrqn for reporting this issue.
Show details on NVD website
To clipboard 

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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